{
  "title": "Time and Work Problems - Grade 7 ICSE",
  "total_questions": 60,
  "questions": [
    {
      "id": 1,
      "difficulty": "easy",
      "question": "👷 A can do a piece of work in 10 days. How much work in 1 day?",
      "options": { "A": "1/8", "B": "1/9", "C": "1/10", "D": "1/11" },
      "correct_answer": "C"
    },
    {
      "id": 2,
      "difficulty": "easy",
      "question": "🛠️ B can complete work in 15 days. Work done in 3 days?",
      "options": { "A": "1/4", "B": "1/5", "C": "1/6", "D": "1/7" },
      "correct_answer": "B"
    },
    {
      "id": 3,
      "difficulty": "easy",
      "question": "🏗️ A does 1/4 work in 2 days. Total days to finish alone?",
      "options": { "A": "6", "B": "7", "C": "8", "D": "9" },
      "correct_answer": "C"
    },
    {
      "id": 4,
      "difficulty": "easy",
      "question": "👷‍♂️ A and B together do work in 6 days. A alone in 9 days. B alone in how many days?",
      "options": { "A": "16", "B": "17", "C": "18", "D": "19" },
      "correct_answer": "C"
    },
    {
      "id": 5,
      "difficulty": "easy",
      "question": "📚 If 5 people paint a wall in 8 days, how many days for 10 people?",
      "options": { "A": "3", "B": "4", "C": "5", "D": "6" },
      "correct_answer": "B"
    },
    {
      "id": 6,
      "difficulty": "easy",
      "question": "🍕 8 chefs make 80 pizzas in 2 hours. How many chefs to make 120 pizzas in 2 hours?",
      "options": { "A": "10", "B": "11", "C": "12", "D": "13" },
      "correct_answer": "C"
    },
    {
      "id": 7,
      "difficulty": "easy",
      "question": "🚗 3 machines make 90 parts in 6 hours. How many parts in 4 hours by 2 machines?",
      "options": { "A": "38", "B": "39", "C": "40", "D": "41" },
      "correct_answer": "C"
    },
    {
      "id": 8,
      "difficulty": "easy",
      "question": "⏳ A fills tank in 12 hours, B empties in 15 hours. If both open, net work per hour?",
      "options": { "A": "1/60", "B": "1/50", "C": "1/40", "D": "1/30" },
      "correct_answer": "A"
    },
    {
      "id": 9,
      "difficulty": "easy",
      "question": "🏗️ 6 workers build in 18 days. How many workers to build in 12 days?",
      "options": { "A": "7", "B": "8", "C": "9", "D": "10" },
      "correct_answer": "C"
    },
    {
      "id": 10,
      "difficulty": "easy",
      "question": "📦 4 men pack 48 boxes in 3 hours. Boxes packed by 6 men in 5 hours?",
      "options": { "A": "118", "B": "119", "C": "120", "D": "121" },
      "correct_answer": "C"
    },
    {
      "id": 11,
      "difficulty": "easy",
      "question": "👷‍♀️ A does 1/5 work in 4 days. Whole work in how many days?",
      "options": { "A": "18", "B": "19", "C": "20", "D": "21" },
      "correct_answer": "C"
    },
    {
      "id": 12,
      "difficulty": "easy",
      "question": "🍰 3 bakers bake 15 cakes in 5 hours. Cakes by 5 bakers in 6 hours?",
      "options": { "A": "28", "B": "29", "C": "30", "D": "31" },
      "correct_answer": "C"
    },
    {
      "id": 13,
      "difficulty": "easy",
      "question": "📚 10 students solve 50 problems in 2 hours. Problems solved by 15 students in 3 hours?",
      "options": { "A": "110", "B": "111", "C": "112", "D": "113" },
      "correct_answer": "C"
    },
    {
      "id": 14,
      "difficulty": "easy",
      "question": "🏗️ A+B do work in 8 days, A alone 12 days. B alone days?",
      "options": { "A": "22", "B": "23", "C": "24", "D": "25" },
      "correct_answer": "C"
    },
    {
      "id": 15,
      "difficulty": "easy",
      "question": "🚚 5 trucks carry 30 tonnes in 4 trips. Tonnes by 8 trucks in 6 trips?",
      "options": { "A": "70", "B": "71", "C": "72", "D": "73" },
      "correct_answer": "C"
    },
    {
      "id": 16,
      "difficulty": "easy",
      "question": "⏳ Pipe fills tank in 20 minutes. Part filled in 5 minutes?",
      "options": { "A": "1/3", "B": "1/4", "C": "1/5", "D": "1/6" },
      "correct_answer": "B"
    },
    {
      "id": 17,
      "difficulty": "easy",
      "question": "👷 12 workers in 10 days. Workers needed for 8 days?",
      "options": { "A": "13", "B": "14", "C": "15", "D": "16" },
      "correct_answer": "C"
    },
    {
      "id": 18,
      "difficulty": "easy",
      "question": "📦 If 2 machines make 40 items in 5 hours, items by 3 machines in 10 hours?",
      "options": { "A": "118", "B": "119", "C": "120", "D": "121" },
      "correct_answer": "C"
    },
    {
      "id": 19,
      "difficulty": "easy",
      "question": "🍕 A makes 4 pizzas/hour, B makes 3 pizzas/hour. Together in 2 hours?",
      "options": { "A": "13", "B": "14", "C": "15", "D": "16" },
      "correct_answer": "B"
    },
    {
      "id": 20,
      "difficulty": "easy",
      "question": "🏗️ Work done by 8 people in 6 days. How many people for same work in 3 days?",
      "options": { "A": "14", "B": "15", "C": "16", "D": "17" },
      "correct_answer": "C"
    },
    {
      "id": 21,
      "difficulty": "medium",
      "question": "👷 A does work in 15 days, B in 10 days. Together in how many days?",
      "options": { "A": "5", "B": "5.5", "C": "6", "D": "6.5" },
      "correct_answer": "C"
    },
    {
      "id": 22,
      "difficulty": "medium",
      "question": "🚗 6 pumps empty tank in 8 hours. After 2 hours, 2 pumps fail. Total time to empty?",
      "options": { "A": "10", "B": "11", "C": "12", "D": "13" },
      "correct_answer": "B"
    },
    {
      "id": 23,
      "difficulty": "medium",
      "question": "📚 A+B can do in 12 days, B+C in 15 days, A+C in 20 days. A alone days?",
      "options": { "A": "28", "B": "29", "C": "30", "D": "31" },
      "correct_answer": "C"
    },
    {
      "id": 24,
      "difficulty": "medium",
      "question": "🏗️ 10 men or 15 women do work in 30 days. How many days for 5 men and 10 women?",
      "options": { "A": "18", "B": "19", "C": "20", "D": "21" },
      "correct_answer": "A"
    },
    {
      "id": 25,
      "difficulty": "medium",
      "question": "⏳ Pipe A fills in 6 hours, B empties in 8 hours. Both open, tank fills in?",
      "options": { "A": "22", "B": "23", "C": "24", "D": "25" },
      "correct_answer": "C"
    },
    {
      "id": 26,
      "difficulty": "medium",
      "question": "👷‍♂️ A is twice as fast as B. Together they finish in 9 days. A alone days?",
      "options": { "A": "13", "B": "13.5", "C": "14", "D": "14.5" },
      "correct_answer": "B"
    },
    {
      "id": 27,
      "difficulty": "medium",
      "question": "📦 3 workers in 5 days do 1/4 work. Remaining work done by 5 workers in how many days?",
      "options": { "A": "7", "B": "8", "C": "9", "D": "10" },
      "correct_answer": "C"
    },
    {
      "id": 28,
      "difficulty": "medium",
      "question": "🍰 A can bake 10 cakes in 2 hours, B can bake 15 in 3 hours. Together cakes in 6 hours?",
      "options": { "A": "54", "B": "55", "C": "56", "D": "57" },
      "correct_answer": "B"
    },
    {
      "id": 29,
      "difficulty": "medium",
      "question": "📚 8 typists type 320 pages in 5 days. Pages by 10 typists in 6 days?",
      "options": { "A": "470", "B": "475", "C": "480", "D": "485" },
      "correct_answer": "C"
    },
    {
      "id": 30,
      "difficulty": "medium",
      "question": "👷 A+B = 8 days, A+C = 10 days, B+C = 12 days. All three together days?",
      "options": { "A": "5.45", "B": "6.15", "C": "6.85", "D": "7.2" },
      "correct_answer": "A"
    },
    {
      "id": 31,
      "difficulty": "medium",
      "question": "⏳ 6 taps fill tank in 40 minutes. Time for 10 taps?",
      "options": { "A": "22", "B": "23", "C": "24", "D": "25" },
      "correct_answer": "C"
    },
    {
      "id": 32,
      "difficulty": "medium",
      "question": "🚗 12 machines make 360 parts in 9 hours. Parts by 15 machines in 6 hours?",
      "options": { "A": "298", "B": "299", "C": "300", "D": "301" },
      "correct_answer": "C"
    },
    {
      "id": 33,
      "difficulty": "medium",
      "question": "🏗️ A does 60% work in 12 days, then B joins, they finish in 4 more days. B alone days?",
      "options": { "A": "28", "B": "29", "C": "30", "D": "31" },
      "correct_answer": "C"
    },
    {
      "id": 34,
      "difficulty": "medium",
      "question": "🍕 A+B make 30 pizzas in 2 hours, B+C make 40 in 3 hours, A+C make 35 in 2.5 hours. All together pizzas in 1 hour?",
      "options": { "A": "23", "B": "24", "C": "25", "D": "26" },
      "correct_answer": "C"
    },
    {
      "id": 35,
      "difficulty": "medium",
      "question": "👷‍♀️ 15 women do work in 8 days, 12 men in 6 days. 10 men and 5 women together days?",
      "options": { "A": "5.76", "B": "5.85", "C": "5.94", "D": "6.03" },
      "correct_answer": "A"
    },
    {
      "id": 36,
      "difficulty": "medium",
      "question": "📦 5 workers 8 hours/day take 6 days. How many days for 4 workers 10 hours/day?",
      "options": { "A": "5", "B": "6", "C": "7", "D": "8" },
      "correct_answer": "B"
    },
    {
      "id": 37,
      "difficulty": "medium",
      "question": "⏳ A fills in 10 min, B in 15 min. Both alternately for 1 min each, starting A. Time to fill?",
      "options": { "A": "11 min", "B": "12 min", "C": "13 min", "D": "14 min" },
      "correct_answer": "B"
    },
    {
      "id": 38,
      "difficulty": "medium",
      "question": "🏗️ Work done by 30 men in 16 days. How many men to finish in 20 days?",
      "options": { "A": "22", "B": "23", "C": "24", "D": "25" },
      "correct_answer": "C"
    },
    {
      "id": 39,
      "difficulty": "medium",
      "question": "🍰 4 chefs prepare 80 dishes in 5 hours. Dishes by 7 chefs in 4 hours?",
      "options": { "A": "110", "B": "111", "C": "112", "D": "113" },
      "correct_answer": "C"
    },
    {
      "id": 40,
      "difficulty": "medium",
      "question": "📚 A can copy 40 pages in 10 hours, B 30 pages in 6 hours. Together 110 pages in how many hours?",
      "options": { "A": "9", "B": "9.5", "C": "10", "D": "10.5" },
      "correct_answer": "C"
    },
    {
      "id": 41,
      "difficulty": "hard",
      "question": "👷 A does half as fast as B and C together, B does half as fast as A and C together. C alone does in 12 days. A alone days?",
      "options": { "A": "18", "B": "20", "C": "22", "D": "24" },
      "correct_answer": "B"
    },
    {
      "id": 42,
      "difficulty": "hard",
      "question": "⏳ 2 pipes fill in 15 and 20 min, third empties in 30 min. All open, time to fill?",
      "options": { "A": "12 min", "B": "13 min", "C": "14 min", "D": "15 min" },
      "correct_answer": "A"
    },
    {
      "id": 43,
      "difficulty": "hard",
      "question": "🏗️ 10 men and 15 women do work in 6 days. 5 men and 10 women in 9 days. Man is how many times as efficient as woman?",
      "options": { "A": "1.5", "B": "2", "C": "2.5", "D": "3" },
      "correct_answer": "B"
    },
    {
      "id": 44,
      "difficulty": "hard",
      "question": "📦 12 machines work 8 hours/day for 10 days make 2400 units. How many machines to make 3600 units in 12 days 6 hours/day?",
      "options": { "A": "18", "B": "19", "C": "20", "D": "21" },
      "correct_answer": "C"
    },
    {
      "id": 45,
      "difficulty": "hard",
      "question": "👷‍♂️ A+B do in 20 days, B+C in 25 days, A+C in 30 days. A, B, C together days?",
      "options": { "A": "13.85", "B": "14.28", "C": "15.79", "D": "16.36" },
      "correct_answer": "A"
    },
    {
      "id": 46,
      "difficulty": "hard",
      "question": "⏳ A does 1/3 work in 5 days, B does 1/4 in 6 days, C does rest in 8 days. All together days?",
      "options": { "A": "7.2", "B": "7.5", "C": "7.8", "D": "8.0" },
      "correct_answer": "A"
    },
    {
      "id": 47,
      "difficulty": "hard",
      "question": "🏗️ 30 workers start, after 10 days 10 leave, after another 10 days 10 more join. Total days if work was to finish in 30 days originally?",
      "options": { "A": "32", "B": "33", "C": "34", "D": "35" },
      "correct_answer": "D"
    },
    {
      "id": 48,
      "difficulty": "hard",
      "question": "🍕 3 ovens bake 60 pizzas in 4 hours. If 2 ovens break after 1 hour, total time for 100 pizzas?",
      "options": {
        "A": "7 h 20 min",
        "B": "7 h 30 min",
        "C": "7 h 40 min",
        "D": "7 h 50 min"
      },
      "correct_answer": "A"
    },
    {
      "id": 49,
      "difficulty": "hard",
      "question": "📚 A types 10 pages in 5 hours, B 12 pages in 6 hours, C 15 pages in 5 hours. Together type 74 pages in how many hours?",
      "options": { "A": "5", "B": "5.5", "C": "6", "D": "6.5" },
      "correct_answer": "C"
    },
    {
      "id": 50,
      "difficulty": "hard",
      "question": "🏗️ 8 men or 12 boys do work in 25 days. 6 men and 11 boys together days?",
      "options": { "A": "14", "B": "15", "C": "16", "D": "17" },
      "correct_answer": "B"
    },
    {
      "id": 51,
      "difficulty": "hard",
      "question": "⏳ Leak empties full tank in 10 hours. Pipe fills at 12 L/min, leak empties at 8 L/min. Tank fills in 2 hours. Capacity?",
      "options": { "A": "4800 L", "B": "5000 L", "C": "5200 L", "D": "5400 L" },
      "correct_answer": "A"
    },
    {
      "id": 52,
      "difficulty": "hard",
      "question": "👷 A works twice B, B works thrice C. Together finish in 4 days. C alone days?",
      "options": { "A": "30", "B": "32", "C": "34", "D": "36" },
      "correct_answer": "D"
    },
    {
      "id": 53,
      "difficulty": "hard",
      "question": "📦 2 machines A and B produce 60 units in 2 hours and 3 hours respectively. Together run for 4 hours, then B alone 2 hours. Total units?",
      "options": { "A": "150", "B": "152", "C": "154", "D": "156" },
      "correct_answer": "D"
    },
    {
      "id": 54,
      "difficulty": "hard",
      "question": "🏗️ 20 men complete 1/3 work in 10 days. How many more men to finish in next 10 days?",
      "options": { "A": "18", "B": "19", "C": "20", "D": "21" },
      "correct_answer": "C"
    },
    {
      "id": 55,
      "difficulty": "hard",
      "question": "⏳ A+B fill in 6 hours, A+C in 8 hours, B+C in 12 hours. A alone hours?",
      "options": { "A": "8", "B": "9.6", "C": "10", "D": "11.2" },
      "correct_answer": "B"
    },
    {
      "id": 56,
      "difficulty": "hard",
      "question": "👷‍♀️ 15 women = 12 men in work. 8 men and 8 women do in 10 days. 6 men and 9 women do in?",
      "options": { "A": "12", "B": "13", "C": "14", "D": "15" },
      "correct_answer": "A"
    },
    {
      "id": 57,
      "difficulty": "hard",
      "question": "🍕 Kitchen: 2 cooks make 30 pizzas in 3 hours. If one cook is 50% faster, together make 100 pizzas in?",
      "options": { "A": "8 h", "B": "8.5 h", "C": "9 h", "D": "9.5 h" },
      "correct_answer": "C"
    },
    {
      "id": 58,
      "difficulty": "hard",
      "question": "📚 A+B write book in 20 days, B+C in 25 days, A+C in 30 days. A alone days?",
      "options": { "A": "34.28", "B": "35.45", "C": "36.36", "D": "37.5" },
      "correct_answer": "A"
    },
    {
      "id": 59,
      "difficulty": "hard",
      "question": "🏗️ 30 workers start, each day 2 leave starting day 2. Work finished in 15 days. How many workers needed if all stayed?",
      "options": { "A": "20", "B": "21", "C": "22", "D": "23" },
      "correct_answer": "C"
    },
    {
      "id": 60,
      "difficulty": "hard",
      "question": "⏳ 3 taps A,B,C fill in 10,15,30 min. A and B open for 4 min, then C also opens. Total time to fill?",
      "options": { "A": "6 min", "B": "6.5 min", "C": "7 min", "D": "7.5 min" },
      "correct_answer": "A"
    }
  ]
}