{
  "title": "Capacity - Grade 5 CBSE",
  "total_questions": 100,
  "questions": [
 
   {
    "id": 1,
    "difficulty": "easy",
    "question": "How many milliliters are in 1 liter?",
    "options": {"A": "10 ml", "B": "100 ml", "C": "1000 ml", "D": "10000 ml"},
    "correct_answer": "C"
  },
  {
    "id": 2,
    "difficulty": "easy",
    "question": "Convert 2 liters to milliliters.",
    "options": {"A": "20 ml", "B": "200 ml", "C": "2000 ml", "D": "20000 ml"},
    "correct_answer": "C"
  },
    {
    "id": 3,
    "difficulty": "easy",
    "question": "A bottle contains 500 ml of water. How many such bottles are needed to make 2 liters?",
    "options": {"A": "2", "B": "3", "C": "4", "D": "5"},
    "correct_answer": "C"
  },
  {
    "id": 4,
    "difficulty": "easy",
    "question": "Convert 1500 ml to liters.",
    "options": {"A": "0.15 L", "B": "1.5 L", "C": "15 L", "D": "150 L"},
    "correct_answer": "B"
  },
  {
    "id": 5,
    "difficulty": "easy",
    "question": "How many 250 ml glasses can be filled from a 1 liter jug?",
    "options": {"A": "2", "B": "3", "C": "4", "D": "5"},
    "correct_answer": "C"
  },
  {
    "id": 6,
    "difficulty": "easy",
    "question": "A container has 3.5 liters of milk. How many milliliters is this?",
    "options": {"A": "35 ml", "B": "350 ml", "C": "3500 ml", "D": "35000 ml"},
    "correct_answer": "C"
  },
  {
    "id": 7,
    "difficulty": "easy",
    "question": "Convert 750 ml to liters.",
    "options": {"A": "0.075 L", "B": "0.75 L", "C": "7.5 L", "D": "75 L"},
    "correct_answer": "B"
  },
  {
    "id": 8,
    "difficulty": "easy",
    "question": "A bucket contains 8 liters of water. How many 500 ml bottles can be filled from it?",
    "options": {"A": "14", "B": "15", "C": "16", "D": "17"},
    "correct_answer": "C"
  },
  {
    "id": 9,
    "difficulty": "easy",
    "question": "How many milliliters are in 4.2 liters?",
    "options": {"A": "42 ml", "B": "420 ml", "C": "4200 ml", "D": "42000 ml"},
    "correct_answer": "C"
  },
  {
    "id": 10,
    "difficulty": "easy",
    "question": "Convert 1250 ml to liters.",
    "options": {"A": "0.125 L", "B": "1.25 L", "C": "12.5 L", "D": "125 L"},
    "correct_answer": "B"
  },
  {
    "id": 11,
    "difficulty": "easy",
    "question": "A jug contains 2.5 liters of juice. How many 200 ml glasses can be filled from it?",
    "options": {"A": "10", "B": "11", "C": "12", "D": "13"},
    "correct_answer": "C"
  },
   {
    "id": 12,
    "difficulty": "easy",
    "question": "How many liters are in 3000 ml?",
    "options": {"A": "0.3 L", "B": "3 L", "C": "30 L", "D": "300 L"},
    "correct_answer": "B"
  },
  {
    "id": 13,
    "difficulty": "easy",
    "question": "Convert 0.8 liters to milliliters.",
    "options": {"A": "8 ml", "B": "80 ml", "C": "800 ml", "D": "8000 ml"},
    "correct_answer": "C"
  },
  {
    "id": 14,
    "difficulty": "easy",
    "question": "A bottle holds 1.2 liters of water. How many milliliters is this?",
    "options": {"A": "12 ml", "B": "120 ml", "C": "1200 ml", "D": "12000 ml"},
    "correct_answer": "C"
  },
  {
    "id": 15,
    "difficulty": "easy",
    "question": "How many 500 ml bottles make 2.5 liters?",
    "options": {"A": "4", "B": "5", "C": "6", "D": "7"},
    "correct_answer": "B"
  },
  {
    "id": 16,
    "difficulty": "easy",
    "question": "Convert 1800 ml to liters.",
    "options": {"A": "0.18 L", "B": "1.8 L", "C": "18 L", "D": "180 L"},
    "correct_answer": "B"
  },
    {
    "id": 17,
    "difficulty": "easy",
    "question": "A container has 4.5 liters of oil. How many milliliters is this?",
    "options": {"A": "45 ml", "B": "450 ml", "C": "4500 ml", "D": "45000 ml"},
    "correct_answer": "C"
  },
  {
    "id": 18,
    "difficulty": "easy",
    "question": "How many liters are in 2500 ml?",
    "options": {"A": "0.25 L", "B": "2.5 L", "C": "25 L", "D": "250 L"},
    "correct_answer": "B"
  },
  {
    "id": 19,
    "difficulty": "easy",
    "question": "Convert 0.6 liters to milliliters.",
    "options": {"A": "6 ml", "B": "60 ml", "C": "600 ml", "D": "6000 ml"},
    "correct_answer": "C"
  },
   {
    "id": 20,
    "difficulty": "easy",
    "question": "A tank contains 15 liters of water. How many 750 ml containers can be filled from it?",
    "options": {"A": "18", "B": "19", "C": "20", "D": "21"},
    "correct_answer": "C"
  },
    {"id": 21, "difficulty": "medium", "question": "A bucket contains 12.5 liters of water. If 3.75 liters are used, how much water remains?", "options": {"A": "8.25 L", "B": "8.5 L", "C": "8.75 L", "D": "9 L"}, "correct_answer": "C"},
    {"id": 22, "difficulty": "medium", "question": "A container has 4.8 liters of juice. How many 300 ml glasses can be filled from it?", "options": {"A": "14", "B": "15", "C": "16", "D": "17"}, "correct_answer": "C"},
    {"id": 23, "difficulty": "medium", "question": "Three bottles contain 1.25 L, 850 ml, and 950 ml of water respectively. What is the total volume in liters?", "options": {"A": "2.95 L", "B": "3.05 L", "C": "3.15 L", "D": "3.25 L"}, "correct_answer": "B"},
    {"id": 24, "difficulty": "medium", "question": "A tank can hold 45 liters of water. If it is 3/5 full, how many more liters are needed to fill it completely?", "options": {"A": "16 L", "B": "17 L", "C": "18 L", "D": "19 L"}, "correct_answer": "C"},
    {"id": 25, "difficulty": "medium", "question": "Convert 5.25 liters to milliliters.", "options": {"A": "525 ml", "B": "5250 ml", "C": "52500 ml", "D": "525000 ml"}, "correct_answer": "B"},
    {"id": 26, "difficulty": "medium", "question": "A family uses 2.5 liters of milk daily. How much milk do they use in a week?", "options": {"A": "16.5 L", "B": "17 L", "C": "17.5 L", "D": "18 L"}, "correct_answer": "C"},
    {"id": 27, "difficulty": "medium", "question": "A bottle contains 1.8 liters of soft drink. How many 225 ml glasses can be filled from it?", "options": {"A": "6", "B": "7", "C": "8", "D": "9"}, "correct_answer": "C"},
    {"id": 28, "difficulty": "medium", "question": "The capacity of a jug is 2.4 liters. Express this in milliliters.", "options": {"A": "24 ml", "B": "240 ml", "C": "2400 ml", "D": "24000 ml"}, "correct_answer": "C"},
    {"id": 29, "difficulty": "medium", "question": "A water tank has 180 liters of water. If 45.75 liters are used, how much water remains?", "options": {"A": "133.25 L", "B": "134.25 L", "C": "135.25 L", "D": "136.25 L"}, "correct_answer": "B"},
    {"id": 30, "difficulty": "medium", "question": "How many 150 ml cups can be filled from a 3.6 liter container?", "options": {"A": "22", "B": "23", "C": "24", "D": "25"}, "correct_answer": "C"},
    {"id": 31, "difficulty": "medium", "question": "A recipe requires 1.25 liters of milk. How many 250 ml measures is this?", "options": {"A": "4", "B": "5", "C": "6", "D": "7"}, "correct_answer": "B"},
    {"id": 32, "difficulty": "medium", "question": "Convert 8750 ml to liters.", "options": {"A": "0.875 L", "B": "8.75 L", "C": "87.5 L", "D": "875 L"}, "correct_answer": "B"},
    {"id": 33, "difficulty": "medium", "question": "A container has 6.5 liters of oil. If 2.75 liters are used, how much oil remains?", "options": {"A": "3.25 L", "B": "3.5 L", "C": "3.75 L", "D": "4 L"}, "correct_answer": "C"},
    {"id": 34, "difficulty": "medium", "question": "How many 325 ml bottles can be filled from a 5.2 liter container?", "options": {"A": "14", "B": "15", "C": "16", "D": "17"}, "correct_answer": "C"},
    {"id": 35, "difficulty": "medium", "question": "A tank is 4/7 full and contains 112 liters of water. What is the full capacity of the tank?", "options": {"A": "190 L", "B": "194 L", "C": "196 L", "D": "198 L"}, "correct_answer": "C"},
    {"id": 36, "difficulty": "medium", "question": "Convert 12.75 liters to milliliters.", "options": {"A": "1275 ml", "B": "12750 ml", "C": "127500 ml", "D": "1275000 ml"}, "correct_answer": "B"},
    {"id": 37, "difficulty": "medium", "question": "A family uses 18.5 liters of water for drinking in a week. How much do they use daily?", "options": {"A": "2.5 L", "B": "2.6 L", "C": "2.7 L", "D": "2.8 L"}, "correct_answer": "B"},
    {"id": 38, "difficulty": "medium", "question": "A bottle contains 2.25 liters of juice. How many 180 ml glasses can be filled from it?", "options": {"A": "11", "B": "12", "C": "13", "D": "14"}, "correct_answer": "B"},
    {"id": 39, "difficulty": "medium", "question": "The capacity of a bucket is 15.5 liters. Express this in milliliters.", "options": {"A": "155 ml", "B": "1550 ml", "C": "15500 ml", "D": "155000 ml"}, "correct_answer": "C"},
    {"id": 40, "difficulty": "medium", "question": "A water tank has 240 liters of water. If 78.5 liters are used, how much water remains?", "options": {"A": "160.5 L", "B": "161.5 L", "C": "162.5 L", "D": "163.5 L"}, "correct_answer": "B"},
    {"id": 41, "difficulty": "medium", "question": "How many 275 ml cups can be filled from a 4.4 liter container?", "options": {"A": "14", "B": "15", "C": "16", "D": "17"}, "correct_answer": "C"},
    {"id": 42, "difficulty": "medium", "question": "A recipe requires 2.75 liters of water. How many 250 ml measures is this?", "options": {"A": "10", "B": "11", "C": "12", "D": "13"}, "correct_answer": "B"},
    {"id": 43, "difficulty": "medium", "question": "Convert 9625 ml to liters.", "options": {"A": "0.9625 L", "B": "9.625 L", "C": "96.25 L", "D": "962.5 L"}, "correct_answer": "B"},
    {"id": 44, "difficulty": "medium", "question": "A container has 8.25 liters of milk. If 3.45 liters are used, how much milk remains?", "options": {"A": "4.6 L", "B": "4.7 L", "C": "4.8 L", "D": "4.9 L"}, "correct_answer": "C"},
    {"id": 45, "difficulty": "medium", "question": "How many 350 ml bottles can be filled from a 6.3 liter container?", "options": {"A": "16", "B": "17", "C": "18", "D": "19"}, "correct_answer": "C"},
    {"id": 46, "difficulty": "medium", "question": "A tank is 5/8 full and contains 175 liters of water. What is the full capacity of the tank?", "options": {"A": "275 L", "B": "278 L", "C": "280 L", "D": "282 L"}, "correct_answer": "C"},
    {"id": 47, "difficulty": "medium", "question": "Convert 15.25 liters to milliliters.", "options": {"A": "1525 ml", "B": "15250 ml", "C": "152500 ml", "D": "1525000 ml"}, "correct_answer": "B"},
    {"id": 48, "difficulty": "medium", "question": "A family uses 24.5 liters of water for cooking in a week. How much do they use daily?", "options": {"A": "3.4 L", "B": "3.5 L", "C": "3.6 L", "D": "3.7 L"}, "correct_answer": "B"},
    {"id": 49, "difficulty": "medium", "question": "A bottle contains 3.15 liters of soft drink. How many 210 ml glasses can be filled from it?", "options": {"A": "13", "B": "14", "C": "15", "D": "16"}, "correct_answer": "C"},
    {"id": 50, "difficulty": "medium", "question": "The capacity of a jug is 18.75 liters. Express this in milliliters.", "options": {"A": "1875 ml", "B": "18750 ml", "C": "187500 ml", "D": "1875000 ml"}, "correct_answer": "B"},
    {"id": 51, "difficulty": "medium", "question": "A water tank has 320 liters of water. If 126.8 liters are used, how much water remains?", "options": {"A": "192.2 L", "B": "193.2 L", "C": "194.2 L", "D": "195.2 L"}, "correct_answer": "B"},
    {"id": 52, "difficulty": "medium", "question": "How many 375 ml cups can be filled from a 5.625 liter container?", "options": {"A": "13", "B": "14", "C": "15", "D": "16"}, "correct_answer": "C"},
    {"id": 53, "difficulty": "medium", "question": "A recipe requires 3.25 liters of milk. How many 250 ml measures is this?", "options": {"A": "11", "B": "12", "C": "13", "D": "14"}, "correct_answer": "C"},
    {"id": 54, "difficulty": "medium", "question": "Convert 11375 ml to liters.", "options": {"A": "1.1375 L", "B": "11.375 L", "C": "113.75 L", "D": "1137.5 L"}, "correct_answer": "B"},
    {"id": 55, "difficulty": "medium", "question": "A container has 9.45 liters of oil. If 4.28 liters are used, how much oil remains?", "options": {"A": "5.07 L", "B": "5.17 L", "C": "5.27 L", "D": "5.37 L"}, "correct_answer": "B"},
    {"id": 56, "difficulty": "medium", "question": "How many 425 ml bottles can be filled from a 7.225 liter container?", "options": {"A": "15", "B": "16", "C": "17", "D": "18"}, "correct_answer": "C"},
    {"id": 57, "difficulty": "medium", "question": "A tank is 3/7 full and contains 135 liters of water. What is the full capacity of the tank?", "options": {"A": "310 L", "B": "313 L", "C": "315 L", "D": "317 L"}, "correct_answer": "C"},
    {"id": 58, "difficulty": "medium", "question": "Convert 18.75 liters to milliliters.", "options": {"A": "1875 ml", "B": "18750 ml", "C": "187500 ml", "D": "1875000 ml"}, "correct_answer": "B"},
    {"id": 59, "difficulty": "medium", "question": "A family uses 31.5 liters of water for bathing in a week. How much do they use daily?", "options": {"A": "4.3 L", "B": "4.4 L", "C": "4.5 L", "D": "4.6 L"}, "correct_answer": "C"},
    {"id": 60, "difficulty": "medium", "question": "A bottle contains 4.2 liters of juice. How many 240 ml glasses can be filled from it?", "options": {"A": "16", "B": "17", "C": "18", "D": "19"}, "correct_answer": "B"},
    {"id": 61, "difficulty": "medium", "question": "The capacity of a bucket is 22.5 liters. Express this in milliliters.", "options": {"A": "225 ml", "B": "2250 ml", "C": "22500 ml", "D": "225000 ml"}, "correct_answer": "C"},
    {"id": 62, "difficulty": "medium", "question": "A water tank has 450 liters of water. If 187.25 liters are used, how much water remains?", "options": {"A": "261.75 L", "B": "262.75 L", "C": "263.75 L", "D": "264.75 L"}, "correct_answer": "B"},
    {"id": 63, "difficulty": "medium", "question": "How many 475 ml cups can be filled from a 8.075 liter container?", "options": {"A": "15", "B": "16", "C": "17", "D": "18"}, "correct_answer": "C"},
    {"id": 64, "difficulty": "medium", "question": "A recipe requires 4.75 liters of water. How many 250 ml measures is this?", "options": {"A": "17", "B": "18", "C": "19", "D": "20"}, "correct_answer": "C"},
    {"id": 65, "difficulty": "medium", "question": "Convert 12625 ml to liters.", "options": {"A": "1.2625 L", "B": "12.625 L", "C": "126.25 L", "D": "1262.5 L"}, "correct_answer": "B"},
    {"id": 66, "difficulty": "medium", "question": "A container has 10.85 liters of milk. If 5.47 liters are used, how much milk remains?", "options": {"A": "5.28 L", "B": "5.38 L", "C": "5.48 L", "D": "5.58 L"}, "correct_answer": "B"},
    {"id": 67, "difficulty": "medium", "question": "How many 525 ml bottles can be filled from a 8.925 liter container?", "options": {"A": "15", "B": "16", "C": "17", "D": "18"}, "correct_answer": "C"},
    {"id": 68, "difficulty": "medium", "question": "A tank is 4/9 full and contains 160 liters of water. What is the full capacity of the tank?", "options": {"A": "355 L", "B": "358 L", "C": "360 L", "D": "362 L"}, "correct_answer": "C"},
    {"id": 69, "difficulty": "medium", "question": "Convert 21.25 liters to milliliters.", "options": {"A": "2125 ml", "B": "21250 ml", "C": "212500 ml", "D": "2125000 ml"}, "correct_answer": "B"},
    {"id": 70, "difficulty": "medium", "question": "A family uses 38.5 liters of water for washing in a week. How much do they use daily?", "options": {"A": "5.3 L", "B": "5.4 L", "C": "5.5 L", "D": "5.6 L"}, "correct_answer": "C"},
    {"id": 71, "difficulty": "medium", "question": "A bottle contains 5.4 liters of soft drink. How many 270 ml glasses can be filled from it?", "options": {"A": "18", "B": "19", "C": "20", "D": "21"}, "correct_answer": "C"},
    {"id": 72, "difficulty": "medium", "question": "The capacity of a jug is 25.75 liters. Express this in milliliters.", "options": {"A": "2575 ml", "B": "25750 ml", "C": "257500 ml", "D": "2575000 ml"}, "correct_answer": "B"},
    {"id": 73, "difficulty": "medium", "question": "A water tank has 580 liters of water. If 243.75 liters are used, how much water remains?", "options": {"A": "335.25 L", "B": "336.25 L", "C": "337.25 L", "D": "338.25 L"}, "correct_answer": "B"},
    {"id": 74, "difficulty": "medium", "question": "How many 575 ml cups can be filled from a 9.775 liter container?", "options": {"A": "15", "B": "16", "C": "17", "D": "18"}, "correct_answer": "C"},
    {"id": 75, "difficulty": "medium", "question": "A recipe requires 5.25 liters of milk. How many 250 ml measures is this?", "options": {"A": "19", "B": "20", "C": "21", "D": "22"}, "correct_answer": "C"},
    {"id": 76, "difficulty": "medium", "question": "Convert 13875 ml to liters.", "options": {"A": "1.3875 L", "B": "13.875 L", "C": "138.75 L", "D": "1387.5 L"}, "correct_answer": "B"},
    {"id": 77, "difficulty": "medium", "question": "A container has 12.65 liters of oil. If 6.89 liters are used, how much oil remains?", "options": {"A": "5.66 L", "B": "5.76 L", "C": "5.86 L", "D": "5.96 L"}, "correct_answer": "B"},
    {"id": 78, "difficulty": "medium", "question": "How many 625 ml bottles can be filled from a 10.625 liter container?", "options": {"A": "15", "B": "16", "C": "17", "D": "18"}, "correct_answer": "C"},
    {"id": 79, "difficulty": "medium", "question": "A tank is 5/11 full and contains 185 liters of water. What is the full capacity of the tank?", "options": {"A": "405 L", "B": "407 L", "C": "409 L", "D": "411 L"}, "correct_answer": "B"},
    {"id": 80, "difficulty": "medium", "question": "Convert 24.5 liters to milliliters.", "options": {"A": "245 ml", "B": "2450 ml", "C": "24500 ml", "D": "245000 ml"}, "correct_answer": "C"},

    {"id": 81, "difficulty": "hard", "question": "A tank is filled by three pipes. The first pipe can fill it in 4 hours, the second in 5 hours, and the third in 6 hours. If all three pipes are opened together, how long will it take to fill the tank?", "options": {"A": "1 hour 37 minutes", "B": "1 hour 38 minutes", "C": "1 hour 39 minutes", "D": "1 hour 40 minutes"}, "correct_answer": "B"},
   {
  "id": 82,
  "difficulty": "hard",
  "question": "A container has a mixture of 18 liters of milk and water in the ratio 5:4. How much water should be added to make the ratio 2:3?",
  "options": {"A": "7 liters", "B": "8 liters", "C": "9 liters", "D": "10 liters"},
  "correct_answer": "A"
}, {
  "id": 83,
  "difficulty": "hard", 
  "question": "Two containers contain milk and water in the ratio 3:2 and 5:3 respectively. What is the ratio of milk to water if equal quantities are mixed?",
  "options": {"A": "31:19", "B": "32:19", "C": "33:19", "D": "34:19"},
  "correct_answer": "A"
}, {"id": 84, "difficulty": "hard", "question": "A tank can be filled by pipe A in 6 hours and emptied by pipe B in 8 hours. If both pipes are opened together, how long will it take to fill the empty tank?", "options": {"A": "22 hours", "B": "23 hours", "C": "24 hours", "D": "25 hours"}, "correct_answer": "C"},
    {"id": 85, "difficulty": "hard", "question": "A container has 45 liters of a mixture containing milk and water in the ratio 7:2. How much water should be added to make the ratio 7:3?", "options": {"A": "4 liters", "B": "5 liters", "C": "6 liters", "D": "7 liters"}, "correct_answer": "B"},
    {"id": 86, "difficulty": "hard", "question": "Two pipes can fill a tank in 12 and 15 hours respectively. A third pipe can empty it in 10 hours. If all pipes are opened together, how long will it take to fill the empty tank?", "options": {"A": "18 hours", "B": "19 hours", "C": "20 hours", "D": "21 hours"}, "correct_answer": "C"},
    {"id": 87, "difficulty": "hard", "question": "A mixture contains milk and water in the ratio 8:5. If 26 liters of water is added, the ratio becomes 8:7. What was the original quantity of milk?", "options": {"A": "100 liters", "B": "102 liters", "C": "104 liters", "D": "106 liters"}, "correct_answer": "C"},
   {
  "id": 88,
  "difficulty": "hard",
  "question": "Pipe A can fill a tank in 5 hours, pipe B in 4 hours, and pipe C can empty it in 3 hours. If all pipes are opened together, what fraction of the tank will be filled in 2 hours?",
  "options": {"A": "7/30", "B": "11/30", "C": "13/30", "D": "17/30"},
  "correct_answer": "A"
}, {"id": 89, "difficulty": "hard", "question": "A container has 60 liters of a mixture containing milk and water in the ratio 5:3. How much milk should be added to make the ratio 3:1?", "options": {"A": "18 liters", "B": "20 liters", "C": "22 liters", "D": "24 liters"}, "correct_answer": "B"},
    {"id": 90, "difficulty": "hard", "question": "Two pipes can fill a tank in 20 and 30 minutes respectively. Both are opened together, but after 5 minutes, the first pipe is closed. How long will it take to fill the remaining part?", "options": {"A": "16.5 minutes", "B": "17.5 minutes", "C": "18.5 minutes", "D": "19.5 minutes"}, "correct_answer": "B"},
    {"id": 91, "difficulty": "hard", "question": "A mixture contains milk and water in the ratio 9:4. If 26 liters of the mixture is replaced by 26 liters of water, the ratio becomes 9:13. What was the original quantity of the mixture?", "options": {"A": "85 liters", "B": "87 liters", "C": "89 liters", "D": "91 liters"}, "correct_answer": "C"},
    {"id": 92, "difficulty": "hard", "question": "Pipe A can fill a tank in 8 hours, pipe B in 12 hours, and pipe C can empty it in 6 hours. If A and B are opened for 2 hours and then C is also opened, how long will it take to fill the tank?", "options": {"A": "10 hours", "B": "11 hours", "C": "12 hours", "D": "13 hours"}, "correct_answer": "C"},
  {
  "id": 93,
  "difficulty": "hard",
  "question": "A container has 80 liters of a mixture containing milk and water in the ratio 7:3. How much water should be removed to make the ratio 7:2?",
  "options": {"A": "8 liters", "B": "9 liters", "C": "10 liters", "D": "11 liters"},
  "correct_answer": "A"
},  {"id": 94, "difficulty": "hard", "question": "Two pipes can fill a tank in 15 and 20 hours respectively. A third pipe can empty it in 12 hours. If the tank is empty and all pipes are opened, what percentage of the tank will be filled in 5 hours?", "options": {"A": "25%", "B": "30%", "C": "35%", "D": "40%"}, "correct_answer": "A"},
    {"id": 95, "difficulty": "hard", "question": "A mixture contains milk and water in the ratio 11:7. If 36 liters of the mixture is replaced by 36 liters of milk, the ratio becomes 5:3. What was the original quantity of the mixture?", "options": {"A": "140 liters", "B": "142 liters", "C": "144 liters", "D": "146 liters"}, "correct_answer": "C"},
    {"id": 96, "difficulty": "hard", "question": "Pipe A can fill a tank in 10 hours, pipe B in 15 hours, and pipe C can empty it in 12 hours. If A and B are opened for 4 hours and then C is also opened, how long will it take to fill the remaining tank?", "options": {"A": "2 hours", "B": "3 hours", "C": "4 hours", "D": "5 hours"}, "correct_answer": "C"},
    {"id": 97, "difficulty": "hard", "question": "A container has 120 liters of a mixture containing milk and water in the ratio 13:7. How much milk should be added to make the ratio 4:1?", "options": {"A": "36 liters", "B": "38 liters", "C": "40 liters", "D": "42 liters"}, "correct_answer": "C"},
    {"id": 98, "difficulty": "hard", "question": "Two pipes can fill a tank in 25 and 40 minutes respectively. Both are opened together, but after 8 minutes, the second pipe is closed. How long will it take to fill the remaining part?", "options": {"A": "12.25 minutes", "B": "12.75 minutes", "C": "13.25 minutes", "D": "13.75 minutes"}, "correct_answer": "D"},
    {"id": 99, "difficulty": "hard", "question": "A mixture contains milk and water in the ratio 17:8. If 50 liters of the mixture is replaced by 50 liters of water, the ratio becomes 17:18. What was the original quantity of the mixture?", "options": {"A": "195 liters", "B": "197 liters", "C": "199 liters", "D": "201 liters"}, "correct_answer": "C"},
    {"id": 100, "difficulty": "hard", "question": "Pipe A can fill a tank in 12 hours, pipe B in 18 hours, and pipe C can empty it in 9 hours. If A and B are opened for 6 hours and then C is also opened, how long will it take to fill the tank from the beginning?", "options": {"A": "18 hours", "B": "19 hours", "C": "20 hours", "D": "21 hours"}, "correct_answer": "A"}
  ]
}