{
  "title": "Unitary Method (Ratio and Proportion) - Grade 6 CBSE",
  "total_questions": 150,
  "questions": [
    {"id": 1, "difficulty": "easy", "question": "If 5 pens cost ₹75, what is the cost of 8 pens?", "options": {"A": "₹110", "B": "₹115", "C": "₹120", "D": "₹125"}, "correct_answer": "C"},
    {"id": 2, "difficulty": "easy", "question": "A car travels 240 km in 4 hours. How far will it travel in 7 hours?", "options": {"A": "400 km", "B": "410 km", "C": "420 km", "D": "430 km"}, "correct_answer": "C"},
    {"id": 3, "difficulty": "easy", "question": "If 8 books cost ₹400, what is the cost of 12 books?", "options": {"A": "₹550", "B": "₹575", "C": "₹600", "D": "₹625"}, "correct_answer": "C"},
    {"id": 4, "difficulty": "easy", "question": "A worker earns ₹1500 in 5 days. How much will he earn in 12 days?", "options": {"A": "₹3400", "B": "₹3500", "C": "₹3600", "D": "₹3700"}, "correct_answer": "C"},
    {"id": 5, "difficulty": "easy", "question": "If 15 oranges cost ₹90, what is the cost of 25 oranges?", "options": {"A": "₹140", "B": "₹145", "C": "₹150", "D": "₹155"}, "correct_answer": "C"},
    {"id": 6, "difficulty": "easy", "question": "A train covers 300 km in 5 hours. How far will it cover in 9 hours?", "options": {"A": "520 km", "B": "530 km", "C": "540 km", "D": "550 km"}, "correct_answer": "C"},
    {"id": 7, "difficulty": "easy", "question": "If 7 shirts cost ₹2100, what is the cost of 11 shirts?", "options": {"A": "₹3200", "B": "₹3250", "C": "₹3300", "D": "₹3350"}, "correct_answer": "C"},
    {"id": 8, "difficulty": "easy", "question": "A machine produces 120 items in 3 hours. How many items will it produce in 8 hours?", "options": {"A": "310", "B": "315", "C": "320", "D": "325"}, "correct_answer": "C"},
    {"id": 9, "difficulty": "easy", "question": "If 9 kg of sugar costs ₹360, what is the cost of 15 kg?", "options": {"A": "₹580", "B": "₹590", "C": "₹600", "D": "₹610"}, "correct_answer": "C"},
    {"id": 10, "difficulty": "easy", "question": "A cyclist covers 45 km in 3 hours. How far will he cover in 7 hours?", "options": {"A": "100 km", "B": "105 km", "C": "110 km", "D": "115 km"}, "correct_answer": "B"},
    {"id": 11, "difficulty": "easy", "question": "If 12 notebooks cost ₹300, what is the cost of 20 notebooks?", "options": {"A": "₹480", "B": "₹490", "C": "₹500", "D": "₹510"}, "correct_answer": "C"},
    {"id": 12, "difficulty": "easy", "question": "A pipe fills 60 liters in 5 minutes. How much will it fill in 12 minutes?", "options": {"A": "140 L", "B": "142 L", "C": "144 L", "D": "146 L"}, "correct_answer": "C"},
    {"id": 13, "difficulty": "easy", "question": "If 18 meters of cloth costs ₹900, what is the cost of 25 meters?", "options": {"A": "₹1225", "B": "₹1235", "C": "₹1245", "D": "₹1250"}, "correct_answer": "D"},
    {"id": 14, "difficulty": "easy", "question": "A man walks 28 km in 4 hours. How far will he walk in 9 hours?", "options": {"A": "61 km", "B": "62 km", "C": "63 km", "D": "64 km"}, "correct_answer": "C"},
    {"id": 15, "difficulty": "easy", "question": "If 22 apples cost ₹330, what is the cost of 35 apples?", "options": {"A": "₹515", "B": "₹520", "C": "₹525", "D": "₹530"}, "correct_answer": "C"},
    {"id": 16, "difficulty": "easy", "question": "A pump empties 180 liters in 6 minutes. How much will it empty in 15 minutes?", "options": {"A": "440 L", "B": "445 L", "C": "450 L", "D": "455 L"}, "correct_answer": "C"},
    {"id": 17, "difficulty": "easy", "question": "If 14 kg of rice costs ₹560, what is the cost of 23 kg?", "options": {"A": "₹900", "B": "₹910", "C": "₹920", "D": "₹930"}, "correct_answer": "C"},
    {"id": 18, "difficulty": "easy", "question": "A bus covers 160 km in 4 hours. How far will it cover in 11 hours?", "options": {"A": "430 km", "B": "435 km", "C": "440 km", "D": "445 km"}, "correct_answer": "C"},
    {"id": 19, "difficulty": "easy", "question": "If 16 pens cost ₹240, what is the cost of 27 pens?", "options": {"A": "₹400", "B": "₹405", "C": "₹410", "D": "₹415"}, "correct_answer": "B"},
    {"id": 20, "difficulty": "easy", "question": "A worker makes 48 toys in 6 days. How many toys will he make in 15 days?", "options": {"A": "115", "B": "118", "C": "120", "D": "122"}, "correct_answer": "C"},

    {"id": 21, "difficulty": "medium", "question": "If 15 men can complete a work in 24 days, how many days will 18 men take?", "options": {"A": "18 days", "B": "19 days", "C": "20 days", "D": "21 days"}, "correct_answer": "C"},
    {"id": 22, "difficulty": "medium", "question": "A car travels 180 km consuming 12 liters of petrol. How far will it travel on 20 liters?", "options": {"A": "290 km", "B": "295 km", "C": "300 km", "D": "305 km"}, "correct_answer": "C"},
    {"id": 23, "difficulty": "medium", "question": "If 8 machines produce 480 items in 6 hours, how many items will 12 machines produce in 4 hours?", "options": {"A": "460", "B": "470", "C": "480", "D": "490"}, "correct_answer": "C"},
    {"id": 24, "difficulty": "medium", "question": "A garrison has food for 200 soldiers for 45 days. How long will it last for 150 soldiers?", "options": {"A": "58 days", "B": "59 days", "C": "60 days", "D": "61 days"}, "correct_answer": "C"},
    {"id": 25, "difficulty": "medium", "question": "If 5 pumps can empty a tank in 36 minutes, how long will 9 pumps take?", "options": {"A": "18 minutes", "B": "19 minutes", "C": "20 minutes", "D": "21 minutes"}, "correct_answer": "C"},
    {"id": 26, "difficulty": "medium", "question": "A car covers 315 km in 7 hours. How much time will it take to cover 450 km?", "options": {"A": "9 hours", "B": "10 hours", "C": "11 hours", "D": "12 hours"}, "correct_answer": "B"},
    {"id": 27, "difficulty": "medium", "question": "If 12 workers build a wall in 15 days, how many workers are needed to build it in 9 days?", "options": {"A": "18", "B": "19", "C": "20", "D": "21"}, "correct_answer": "C"},
    {"id": 28, "difficulty": "medium", "question": "A train travels 280 km in 4 hours. How long will it take to travel 455 km?", "options": {"A": "6.3 hours", "B": "6.4 hours", "C": "6.5 hours", "D": "6.6 hours"}, "correct_answer": "C"},
    {"id": 29, "difficulty": "medium", "question": "If 18 men can dig a trench in 10 days, how many men can dig it in 12 days?", "options": {"A": "14", "B": "15", "C": "16", "D": "17"}, "correct_answer": "B"},
    {"id": 30, "difficulty": "medium", "question": "A car gives 15 km per liter of petrol. How many liters are needed for 225 km?", "options": {"A": "14 L", "B": "15 L", "C": "16 L", "D": "17 L"}, "correct_answer": "B"},
    {"id": 31, "difficulty": "medium", "question": "If 24 workers complete a job in 14 days, how many days will 28 workers take?", "options": {"A": "11 days", "B": "12 days", "C": "13 days", "D": "14 days"}, "correct_answer": "B"},
    {"id": 32, "difficulty": "medium", "question": "A train covers 360 km in 6 hours. How long will it take to cover 540 km?", "options": {"A": "8 hours", "B": "8.5 hours", "C": "9 hours", "D": "9.5 hours"}, "correct_answer": "C"},
    {"id": 33, "difficulty": "medium", "question": "If 15 machines produce 600 units in 8 hours, how many units will 25 machines produce in 6 hours?", "options": {"A": "735", "B": "740", "C": "745", "D": "750"}, "correct_answer": "D"},
    {"id": 34, "difficulty": "medium", "question": "A camp has food for 120 people for 25 days. How long will it last for 150 people?", "options": {"A": "19 days", "B": "20 days", "C": "21 days", "D": "22 days"}, "correct_answer": "B"},
    {"id": 35, "difficulty": "medium", "question": "If 8 pipes can fill a tank in 42 minutes, how long will 12 pipes take?", "options": {"A": "26 minutes", "B": "27 minutes", "C": "28 minutes", "D": "29 minutes"}, "correct_answer": "C"},
    {"id": 36, "difficulty": "medium", "question": "A car covers 400 km in 8 hours. How much time for 650 km?", "options": {"A": "12.8 hours", "B": "12.9 hours", "C": "13 hours", "D": "13.1 hours"}, "correct_answer": "C"},
    {"id": 37, "difficulty": "medium", "question": "If 20 workers build a house in 18 days, how many workers needed for 15 days?", "options": {"A": "23", "B": "24", "C": "25", "D": "26"}, "correct_answer": "B"},
    {"id": 38, "difficulty": "medium", "question": "A train travels 420 km in 7 hours. How long for 600 km?", "options": {"A": "9.8 hours", "B": "9.9 hours", "C": "10 hours", "D": "10.1 hours"}, "correct_answer": "C"},
    {"id": 39, "difficulty": "medium", "question": "If 25 men can complete work in 16 days, how many men for 20 days?", "options": {"A": "19", "B": "20", "C": "21", "D": "22"}, "correct_answer": "B"},
    {"id": 40, "difficulty": "medium", "question": "A car gives 18 km per liter. How many liters for 324 km?", "options": {"A": "17 L", "B": "18 L", "C": "19 L", "D": "20 L"}, "correct_answer": "B"},
    {"id": 41, "difficulty": "medium", "question": "If 30 workers complete job in 12 days, how many days for 36 workers?", "options": {"A": "9 days", "B": "9.5 days", "C": "10 days", "D": "10.5 days"}, "correct_answer": "C"},
    {"id": 42, "difficulty": "medium", "question": "A train covers 480 km in 8 hours. How long for 660 km?", "options": {"A": "10.8 hours", "B": "10.9 hours", "C": "11 hours", "D": "11.1 hours"}, "correct_answer": "C"},
    {"id": 43, "difficulty": "medium", "question": "If 16 machines produce 800 items in 10 hours, how many items will 20 machines produce in 8 hours?", "options": {"A": "790", "B": "795", "C": "800", "D": "805"}, "correct_answer": "C"},
    {"id": 44, "difficulty": "medium", "question": "A hostel has food for 150 students for 30 days. How long for 180 students?", "options": {"A": "24 days", "B": "24.5 days", "C": "25 days", "D": "25.5 days"}, "correct_answer": "C"},
    {"id": 45, "difficulty": "medium", "question": "If 10 pumps empty tank in 48 minutes, how long for 15 pumps?", "options": {"A": "31 minutes", "B": "32 minutes", "C": "33 minutes", "D": "34 minutes"}, "correct_answer": "B"},
    {"id": 46, "difficulty": "medium", "question": "A car covers 540 km in 9 hours. How much time for 750 km?", "options": {"A": "12.3 hours", "B": "12.4 hours", "C": "12.5 hours", "D": "12.6 hours"}, "correct_answer": "C"},
    {"id": 47, "difficulty": "medium", "question": "If 22 workers build wall in 14 days, how many workers for 11 days?", "options": {"A": "27", "B": "28", "C": "29", "D": "30"}, "correct_answer": "B"},
    {"id": 48, "difficulty": "medium", "question": "A train travels 560 km in 8 hours. How long for 770 km?", "options": {"A": "10.8 hours", "B": "10.9 hours", "C": "11 hours", "D": "11.1 hours"}, "correct_answer": "C"},
    {"id": 49, "difficulty": "medium", "question": "If 28 men complete work in 15 days, how many men for 21 days?", "options": {"A": "19", "B": "20", "C": "21", "D": "22"}, "correct_answer": "B"},
    {"id": 50, "difficulty": "medium", "question": "A car gives 20 km per liter. How many liters for 360 km?", "options": {"A": "17 L", "B": "18 L", "C": "19 L", "D": "20 L"}, "correct_answer": "B"},
    {"id": 51, "difficulty": "medium", "question": "If 32 workers complete job in 11 days, how many days for 44 workers?", "options": {"A": "7 days", "B": "7.5 days", "C": "8 days", "D": "8.5 days"}, "correct_answer": "C"},
    {"id": 52, "difficulty": "medium", "question": "A train covers 600 km in 10 hours. How long for 840 km?", "options": {"A": "13.8 hours", "B": "13.9 hours", "C": "14 hours", "D": "14.1 hours"}, "correct_answer": "C"},
    {"id": 53, "difficulty": "medium", "question": "If 18 machines produce 900 items in 12 hours, how many items will 24 machines produce in 9 hours?", "options": {"A": "885", "B": "890", "C": "895", "D": "900"}, "correct_answer": "D"},
    {"id": 54, "difficulty": "medium", "question": "A school has food for 200 children for 35 days. How long for 250 children?", "options": {"A": "27 days", "B": "27.5 days", "C": "28 days", "D": "28.5 days"}, "correct_answer": "C"},
    {"id": 55, "difficulty": "medium", "question": "If 12 pumps empty tank in 54 minutes, how long for 18 pumps?", "options": {"A": "35 minutes", "B": "36 minutes", "C": "37 minutes", "D": "38 minutes"}, "correct_answer": "B"},
    {"id": 56, "difficulty": "medium", "question": "A car covers 660 km in 11 hours. How much time for 900 km?", "options": {"A": "14.8 hours", "B": "14.9 hours", "C": "15 hours", "D": "15.1 hours"}, "correct_answer": "C"},
    {"id": 57, "difficulty": "medium", "question": "If 26 workers build wall in 13 days, how many workers for 11 days?", "options": {"A": "30", "B": "31", "C": "32", "D": "33"}, "correct_answer": "B"},
    {"id": 58, "difficulty": "medium", "question": "A train travels 680 km in 10 hours. How long for 952 km?", "options": {"A": "13.8 hours", "B": "13.9 hours", "C": "14 hours", "D": "14.1 hours"}, "correct_answer": "C"},
    {"id": 59, "difficulty": "medium", "question": "If 35 men complete work in 12 days, how many men for 15 days?", "options": {"A": "27", "B": "28", "C": "29", "D": "30"}, "correct_answer": "B"},
    {"id": 60, "difficulty": "medium", "question": "A car gives 22 km per liter. How many liters for 396 km?", "options": {"A": "17 L", "B": "18 L", "C": "19 L", "D": "20 L"}, "correct_answer": "B"},
    {"id": 61, "difficulty": "medium", "question": "If 40 workers complete job in 9 days, how many days for 60 workers?", "options": {"A": "5.8 days", "B": "5.9 days", "C": "6 days", "D": "6.1 days"}, "correct_answer": "C"},
    {"id": 62, "difficulty": "medium", "question": "A train covers 720 km in 12 hours. How long for 960 km?", "options": {"A": "15.8 hours", "B": "15.9 hours", "C": "16 hours", "D": "16.1 hours"}, "correct_answer": "C"},
    {"id": 63, "difficulty": "medium", "question": "If 20 machines produce 1000 items in 15 hours, how many items will 30 machines produce in 10 hours?", "options": {"A": "985", "B": "990", "C": "995", "D": "1000"}, "correct_answer": "D"},
    {"id": 64, "difficulty": "medium", "question": "A hostel has food for 180 students for 28 days. How long for 210 students?", "options": {"A": "23 days", "B": "23.5 days", "C": "24 days", "D": "24.5 days"}, "correct_answer": "C"},
    {"id": 65, "difficulty": "medium", "question": "If 15 pumps empty tank in 60 minutes, how long for 25 pumps?", "options": {"A": "35 minutes", "B": "36 minutes", "C": "37 minutes", "D": "38 minutes"}, "correct_answer": "B"},
    {"id": 66, "difficulty": "medium", "question": "A car covers 780 km in 13 hours. How much time for 1080 km?", "options": {"A": "17.8 hours", "B": "17.9 hours", "C": "18 hours", "D": "18.1 hours"}, "correct_answer": "C"},
    {"id": 67, "difficulty": "medium", "question": "If 30 workers build wall in 11 days, how many workers for 8 days?", "options": {"A": "40", "B": "41", "C": "42", "D": "43"}, "correct_answer": "B"},
    {"id": 68, "difficulty": "medium", "question": "A train travels 800 km in 10 hours. How long for 1120 km?", "options": {"A": "13.8 hours", "B": "13.9 hours", "C": "14 hours", "D": "14.1 hours"}, "correct_answer": "C"},
    {"id": 69, "difficulty": "medium", "question": "If 42 men complete work in 10 days, how many men for 14 days?", "options": {"A": "29", "B": "30", "C": "31", "D": "32"}, "correct_answer": "B"},
    {"id": 70, "difficulty": "medium", "question": "A car gives 25 km per liter. How many liters for 450 km?", "options": {"A": "17 L", "B": "18 L", "C": "19 L", "D": "20 L"}, "correct_answer": "B"},
    {"id": 71, "difficulty": "medium", "question": "If 48 workers complete job in 8 days, how many days for 64 workers?", "options": {"A": "5.8 days", "B": "5.9 days", "C": "6 days", "D": "6.1 days"}, "correct_answer": "C"},
    {"id": 72, "difficulty": "medium", "question": "A train covers 840 km in 12 hours. How long for 1155 km?", "options": {"A": "16.3 hours", "B": "16.4 hours", "C": "16.5 hours", "D": "16.6 hours"}, "correct_answer": "C"},
    {"id": 73, "difficulty": "medium", "question": "If 24 machines produce 1200 items in 16 hours, how many items will 36 machines produce in 12 hours?", "options": {"A": "1330", "B": "1340", "C": "1350", "D": "1360"}, "correct_answer": "C"},
    {"id": 74, "difficulty": "medium", "question": "A camp has food for 220 people for 25 days. How long for 275 people?", "options": {"A": "19 days", "B": "19.5 days", "C": "20 days", "D": "20.5 days"}, "correct_answer": "C"},
    {"id": 75, "difficulty": "medium", "question": "If 18 pumps empty tank in 66 minutes, how long for 27 pumps?", "options": {"A": "43 minutes", "B": "44 minutes", "C": "45 minutes", "D": "46 minutes"}, "correct_answer": "B"},
    {"id": 76, "difficulty": "medium", "question": "A car covers 900 km in 15 hours. How much time for 1200 km?", "options": {"A": "19.8 hours", "B": "19.9 hours", "C": "20 hours", "D": "20.1 hours"}, "correct_answer": "C"},
    {"id": 77, "difficulty": "medium", "question": "If 35 workers build wall in 12 days, how many workers for 9 days?", "options": {"A": "46", "B": "47", "C": "48", "D": "49"}, "correct_answer": "B"},
    {"id": 78, "difficulty": "medium", "question": "A train travels 960 km in 12 hours. How long for 1320 km?", "options": {"A": "16.3 hours", "B": "16.4 hours", "C": "16.5 hours", "D": "16.6 hours"}, "correct_answer": "C"},
    {"id": 79, "difficulty": "medium", "question": "If 50 men complete work in 9 days, how many men for 12 days?", "options": {"A": "37", "B": "37.5", "C": "38", "D": "38.5"}, "correct_answer": "B"},
    {"id": 80, "difficulty": "medium", "question": "A car gives 28 km per liter. How many liters for 504 km?", "options": {"A": "17 L", "B": "18 L", "C": "19 L", "D": "20 L"}, "correct_answer": "B"},

    {"id": 81, "difficulty": "hard", "question": "If 15 men or 20 women can complete a work in 30 days, how long will 6 men and 10 women take?", "options": {"A": "20 days", "B": "22 days", "C": "24 days", "D": "26 days"}, "correct_answer": "C"},
    {"id": 82, "difficulty": "hard", "question": "A train covers first 150 km at 50 km/h, next 200 km at 40 km/h. Find average speed for entire journey", "options": {"A": "42.5 km/h", "B": "43.5 km/h", "C": "44.5 km/h", "D": "45.5 km/h"}, "correct_answer": "B"},
    {"id": 83, "difficulty": "hard", "question": "If 12 pumps of type A or 15 pumps of type B can fill a tank in 48 minutes, how long will 4 pumps of type A and 5 pumps of type B take together?", "options": {"A": "40 minutes", "B": "42 minutes", "C": "44 minutes", "D": "46 minutes"}, "correct_answer": "D"},
    {"id": 84, "difficulty": "hard", "question": "A car travels 60 km at 30 km/h, 80 km at 40 km/h, and 100 km at 50 km/h. Find average speed", "options": {"A": "38 km/h", "B": "39 km/h", "C": "40 km/h", "D": "41 km/h"}, "correct_answer": "C"},
    {"id": 85, "difficulty": "hard", "question": "If 10 men or 15 boys can complete work in 24 days, how long will 5 men and 10 boys take?", "options": {"A": "16 days", "B": "18 days", "C": "20 days", "D": "22 days"}, "correct_answer": "B"},
    {"id": 86, "difficulty": "hard", "question": "A train covers 1/3 of journey at 40 km/h, 1/4 at 50 km/h, rest at 60 km/h. If total distance is 360 km, find average speed", "options": {"A": "46.8 km/h", "B": "47.8 km/h", "C": "48.8 km/h", "D": "49.8 km/h"}, "correct_answer": "C"},
    {"id": 87, "difficulty": "hard", "question": "If 8 large pumps or 12 small pumps can empty tank in 60 minutes, how long will 3 large and 6 small pumps take?", "options": {"A": "40 minutes", "B": "42 minutes", "C": "44 minutes", "D": "46 minutes"}, "correct_answer": "D"},
    {"id": 88, "difficulty": "hard", "question": "A car travels first half of distance at 40 km/h, second half at 60 km/h. Find average speed", "options": {"A": "46 km/h", "B": "47 km/h", "C": "48 km/h", "D": "49 km/h"}, "correct_answer": "C"},
    {"id": 89, "difficulty": "hard", "question": "If 18 women or 27 children can complete work in 20 days, how long will 12 women and 9 children take?", "options": {"A": "12 days", "B": "14 days", "C": "16 days", "D": "18 days"}, "correct_answer": "D"},
    {"id": 90, "difficulty": "hard", "question": "A train covers first 200 km at 50 km/h, next 300 km at 60 km/h. Find average speed", "options": {"A": "54 km/h", "B": "55 km/h", "C": "56 km/h", "D": "57 km/h"}, "correct_answer": "C"},
    {"id": 91, "difficulty": "hard", "question": "If 16 type X machines or 20 type Y machines can produce 800 units in 10 hours, how many units will 4 type X and 5 type Y produce in 12 hours?", "options": {"A": "720", "B": "730", "C": "740", "D": "750"}, "correct_answer": "A"},
    {"id": 92, "difficulty": "hard", "question": "A car travels 1/4 distance at 20 km/h, 1/2 at 40 km/h, rest at 80 km/h. If total distance 320 km, find average speed", "options": {"A": "38.4 km/h", "B": "39.4 km/h", "C": "40.4 km/h", "D": "41.4 km/h"}, "correct_answer": "C"},
    {"id": 93, "difficulty": "hard", "question": "If 20 men or 30 women or 40 children can complete work in 15 days, how long will 5 men, 10 women and 15 children take?", "options": {"A": "10 days", "B": "12 days", "C": "14 days", "D": "16 days"}, "correct_answer": "B"},
    {"id": 94, "difficulty": "hard", "question": "A train travels first 120 km at 40 km/h, next 180 km at 45 km/h. Find average speed", "options": {"A": "41.8 km/h", "B": "42.8 km/h", "C": "43.8 km/h", "D": "44.8 km/h"}, "correct_answer": "B"},
    {"id": 95, "difficulty": "hard", "question": "If 12 pipes of type A or 18 pipes of type B can fill tank in 72 minutes, how long will 4 pipes of type A and 6 pipes of type B take?", "options": {"A": "48 minutes", "B": "50 minutes", "C": "52 minutes", "D": "54 minutes"}, "correct_answer": "D"},
    {"id": 96, "difficulty": "hard", "question": "A car covers 1/3 distance at 30 km/h, 1/4 at 40 km/h, rest at 60 km/h. If total journey 240 km, find average speed", "options": {"A": "40.9 km/h", "B": "41.9 km/h", "C": "42.9 km/h", "D": "43.9 km/h"}, "correct_answer": "C"},
    {"id": 97, "difficulty": "hard", "question": "If 24 men or 36 women or 48 boys can complete work in 12 days, how long will 6 men, 12 women and 18 boys take?", "options": {"A": "8 days", "B": "9 days", "C": "10 days", "D": "11 days"}, "correct_answer": "B"},
    {"id": 98, "difficulty": "hard", "question": "A train travels first 150 km at 50 km/h, next 250 km at 62.5 km/h. Find average speed", "options": {"A": "55 km/h", "B": "56 km/h", "C": "57 km/h", "D": "58 km/h"}, "correct_answer": "D"},
    {"id": 99, "difficulty": "hard", "question": "If 15 machines of type P or 25 machines of type Q can produce 1500 units in 20 hours, how many units will 6 machines of type P and 10 machines of type Q produce in 15 hours?", "options": {"A": "1080", "B": "1090", "C": "1100", "D": "1110"}, "correct_answer": "A"},
    {"id": 100, "difficulty": "hard", "question": "A car travels 40% distance at 30 km/h, 30% at 40 km/h, rest at 60 km/h. If total distance 200 km, find average speed", "options": {"A": "38.6 km/h", "B": "39.6 km/h", "C": "40.6 km/h", "D": "41.6 km/h"}, "correct_answer": "C"}
  ,
{"id":101,"difficulty":"hard","question":"If 12 men can complete a work in 20 days, how many days will 15 men take?","options":{"A":"14 days","B":"15 days","C":"16 days","D":"18 days"},"correct_answer":"C"},
  {"id":102,"difficulty":"hard","question":"A car covers 300 km in 6 hours. How much time will it take to cover 525 km at same speed?","options":{"A":"9.5 hours","B":"10 hours","C":"10.5 hours","D":"11 hours"},"correct_answer":"C"},
  {"id":103,"difficulty":"hard","question":"If 18 workers can complete a task in 12 days, how many workers are required to complete it in 9 days?","options":{"A":"20","B":"22","C":"24","D":"26"},"correct_answer":"C"},
  {"id":104,"difficulty":"hard","question":"A train travels 360 km in 8 hours. How long will it take to travel 585 km?","options":{"A":"12.5 hours","B":"13 hours","C":"13.5 hours","D":"14 hours"},"correct_answer":"C"},
  {"id":105,"difficulty":"hard","question":"If 10 machines can produce 500 items in 8 hours, how many items will 15 machines produce in 6 hours?","options":{"A":"520","B":"540","C":"560","D":"580"},"correct_answer":"C"},
  {"id":106,"difficulty":"hard","question":"A camp has food for 240 people for 20 days. How long will it last for 300 people?","options":{"A":"14 days","B":"15 days","C":"16 days","D":"18 days"},"correct_answer":"B"},
  {"id":107,"difficulty":"hard","question":"If 16 pipes can fill a tank in 24 minutes, how long will 12 pipes take?","options":{"A":"28 minutes","B":"30 minutes","C":"32 minutes","D":"36 minutes"},"correct_answer":"C"},
  {"id":108,"difficulty":"hard","question":"A car covers 450 km in 9 hours. How much distance will it cover in 13 hours?","options":{"A":"630 km","B":"640 km","C":"650 km","D":"660 km"},"correct_answer":"C"},
  {"id":109,"difficulty":"hard","question":"If 24 men can build a wall in 15 days, how many men are needed to build it in 10 days?","options":{"A":"30","B":"32","C":"36","D":"40"},"correct_answer":"C"},
  {"id":110,"difficulty":"hard","question":"A train runs at a speed of 72 km/h. How much time will it take to cover 540 km?","options":{"A":"6.5 hours","B":"7 hours","C":"7.5 hours","D":"8 hours"},"correct_answer":"C"},

  {"id":111,"difficulty":"hard","question":"If 20 workers complete a job in 18 days, how many days will 30 workers take?","options":{"A":"10 days","B":"11 days","C":"12 days","D":"13 days"},"correct_answer":"C"},
  {"id":112,"difficulty":"hard","question":"A car travels 180 km using 12 liters of petrol. How many liters are needed to travel 420 km?","options":{"A":"26 L","B":"27 L","C":"28 L","D":"29 L"},"correct_answer":"C"},
  {"id":113,"difficulty":"hard","question":"If 14 machines can produce 700 units in 10 hours, how many units will 21 machines produce in 8 hours?","options":{"A":"800","B":"820","C":"840","D":"860"},"correct_answer":"C"},
  {"id":114,"difficulty":"hard","question":"A garrison has food for 360 soldiers for 30 days. How long will it last for 450 soldiers?","options":{"A":"22 days","B":"23 days","C":"24 days","D":"25 days"},"correct_answer":"C"},
  {"id":115,"difficulty":"hard","question":"If 18 pumps empty a tank in 36 minutes, how long will 27 pumps take?","options":{"A":"22 minutes","B":"23 minutes","C":"24 minutes","D":"25 minutes"},"correct_answer":"C"},
  {"id":116,"difficulty":"hard","question":"A car covers 525 km in 7 hours. How long will it take to cover 900 km?","options":{"A":"11.5 hours","B":"12 hours","C":"12.5 hours","D":"13 hours"},"correct_answer":"C"},
  {"id":117,"difficulty":"hard","question":"If 25 men can complete a work in 16 days, how many men are required to complete it in 20 days?","options":{"A":"18","B":"20","C":"22","D":"24"},"correct_answer":"B"},
  {"id":118,"difficulty":"hard","question":"A train covers 640 km in 8 hours. How much time will it take to cover 920 km?","options":{"A":"11.3 hours","B":"11.4 hours","C":"11.5 hours","D":"11.6 hours"},"correct_answer":"C"},
  {"id":119,"difficulty":"hard","question":"If 30 workers complete a task in 12 days, how many workers will complete it in 9 days?","options":{"A":"36","B":"38","C":"40","D":"42"},"correct_answer":"C"},
  {"id":120,"difficulty":"hard","question":"A car gives 24 km per liter. How many liters are required to travel 540 km?","options":{"A":"21 L","B":"22 L","C":"23 L","D":"24 L"},"correct_answer":"C"},

  {"id":121,"difficulty":"hard","question":"If 40 workers can complete a job in 15 days, how many days will 50 workers take?","options":{"A":"10 days","B":"11 days","C":"12 days","D":"13 days"},"correct_answer":"C"},
  {"id":122,"difficulty":"hard","question":"A train covers 900 km in 12 hours. How much distance will it cover in 18 hours?","options":{"A":"1300 km","B":"1320 km","C":"1350 km","D":"1380 km"},"correct_answer":"C"},
  {"id":123,"difficulty":"hard","question":"If 16 machines produce 640 items in 8 hours, how many items will 20 machines produce in 10 hours?","options":{"A":"900","B":"950","C":"1000","D":"1050"},"correct_answer":"C"},
  {"id":124,"difficulty":"hard","question":"A camp has food for 500 people for 18 days. How long will it last for 600 people?","options":{"A":"14 days","B":"15 days","C":"16 days","D":"17 days"},"correct_answer":"C"},
  {"id":125,"difficulty":"hard","question":"If 12 taps fill a tank in 48 minutes, how long will 16 taps take?","options":{"A":"34 minutes","B":"35 minutes","C":"36 minutes","D":"38 minutes"},"correct_answer":"C"},
  {"id":126,"difficulty":"hard","question":"A car travels 600 km in 10 hours. How much time will it take to cover 840 km?","options":{"A":"13.5 hours","B":"14 hours","C":"14.5 hours","D":"15 hours"},"correct_answer":"C"},
  {"id":127,"difficulty":"hard","question":"If 36 men can do a job in 10 days, how many men are needed to do it in 15 days?","options":{"A":"20","B":"22","C":"24","D":"26"},"correct_answer":"C"},
  {"id":128,"difficulty":"hard","question":"A train travels 1080 km in 12 hours. How long will it take to travel 1350 km?","options":{"A":"14.5 hours","B":"15 hours","C":"15.5 hours","D":"16 hours"},"correct_answer":"B"},
  {"id":129,"difficulty":"hard","question":"If 45 workers complete a task in 8 days, how many workers are required to complete it in 6 days?","options":{"A":"54","B":"56","C":"60","D":"62"},"correct_answer":"C"},
  {"id":130,"difficulty":"hard","question":"A car gives 30 km per liter. How many liters are needed to travel 690 km?","options":{"A":"21 L","B":"22 L","C":"23 L","D":"24 L"},"correct_answer":"C"},

  {"id":131,"difficulty":"hard","question":"If 50 men can complete a work in 12 days, how many days will 75 men take?","options":{"A":"7 days","B":"8 days","C":"9 days","D":"10 days"},"correct_answer":"C"},
  {"id":132,"difficulty":"hard","question":"A train covers 750 km in 10 hours. How much time will it take to cover 1050 km?","options":{"A":"13.5 hours","B":"14 hours","C":"14.5 hours","D":"15 hours"},"correct_answer":"C"},
  {"id":133,"difficulty":"hard","question":"If 20 machines produce 800 units in 8 hours, how many units will 30 machines produce in 6 hours?","options":{"A":"850","B":"880","C":"900","D":"920"},"correct_answer":"C"},
  {"id":134,"difficulty":"hard","question":"A hostel has food for 360 students for 20 days. How long will it last for 480 students?","options":{"A":"14 days","B":"15 days","C":"16 days","D":"18 days"},"correct_answer":"C"},
  {"id":135,"difficulty":"hard","question":"If 24 pipes fill a tank in 30 minutes, how long will 18 pipes take?","options":{"A":"36 minutes","B":"38 minutes","C":"40 minutes","D":"42 minutes"},"correct_answer":"C"},
  {"id":136,"difficulty":"hard","question":"A car covers 840 km in 14 hours. How much time will it take to cover 1080 km?","options":{"A":"17 hours","B":"18 hours","C":"19 hours","D":"20 hours"},"correct_answer":"B"},
  {"id":137,"difficulty":"hard","question":"If 28 workers can complete work in 14 days, how many workers are needed to complete it in 7 days?","options":{"A":"48","B":"52","C":"56","D":"60"},"correct_answer":"C"},
  {"id":138,"difficulty":"hard","question":"A train travels 1320 km in 15 hours. How long will it take to travel 1760 km?","options":{"A":"18.5 hours","B":"19 hours","C":"20 hours","D":"21 hours"},"correct_answer":"B"},
  {"id":139,"difficulty":"hard","question":"If 60 men complete work in 9 days, how many men will complete it in 12 days?","options":{"A":"40","B":"42","C":"45","D":"48"},"correct_answer":"C"},
  {"id":140,"difficulty":"hard","question":"A car gives 36 km per liter. How many liters are required to travel 900 km?","options":{"A":"23 L","B":"24 L","C":"25 L","D":"26 L"},"correct_answer":"C"},

  {"id":141,"difficulty":"hard","question":"If 72 workers can complete a task in 8 days, how many days will 48 workers take?","options":{"A":"10 days","B":"11 days","C":"12 days","D":"13 days"},"correct_answer":"C"},
  {"id":142,"difficulty":"hard","question":"A train covers 960 km in 12 hours. How much distance will it cover in 18 hours?","options":{"A":"1320 km","B":"1360 km","C":"1440 km","D":"1500 km"},"correct_answer":"C"},
  {"id":143,"difficulty":"hard","question":"If 25 machines produce 1000 items in 10 hours, how many items will 40 machines produce in 8 hours?","options":{"A":"1100","B":"1150","C":"1200","D":"1250"},"correct_answer":"C"},
  {"id":144,"difficulty":"hard","question":"A camp has food for 420 people for 14 days. How long will it last for 560 people?","options":{"A":"9 days","B":"10 days","C":"11 days","D":"12 days"},"correct_answer":"B"},
  {"id":145,"difficulty":"hard","question":"If 15 taps fill a tank in 50 minutes, how long will 25 taps take?","options":{"A":"28 minutes","B":"29 minutes","C":"30 minutes","D":"32 minutes"},"correct_answer":"C"},
  {"id":146,"difficulty":"hard","question":"A car travels 1000 km in 16 hours. How much time will it take to cover 1250 km?","options":{"A":"18 hours","B":"19 hours","C":"20 hours","D":"21 hours"},"correct_answer":"C"},
  {"id":147,"difficulty":"hard","question":"If 40 men can complete work in 20 days, how many men are needed to complete it in 16 days?","options":{"A":"45","B":"48","C":"50","D":"52"},"correct_answer":"B"},
  {"id":148,"difficulty":"hard","question":"A train covers 1440 km in 18 hours. How long will it take to cover 1920 km?","options":{"A":"22 hours","B":"23 hours","C":"24 hours","D":"25 hours"},"correct_answer":"C"},
  {"id":149,"difficulty":"hard","question":"If 75 workers complete a task in 12 days, how many workers are required to complete it in 9 days?","options":{"A":"90","B":"95","C":"100","D":"105"},"correct_answer":"C"},
  {"id":150,"difficulty":"hard","question":"A car gives 40 km per liter. How many liters are needed to travel 1200 km?","options":{"A":"28 L","B":"29 L","C":"30 L","D":"32 L"},"correct_answer":"C"}
]
}