{
  "title": "Time and Work (Direct and Inverse Variation) - Grade 8 ICSE",
  "total_questions": 60,
  "questions": [
    {
      "id": 1,
      "difficulty": "easy",
      "question": "⏱️ If A completes work in 10 days, in 1 day A does ___ of work.",
      "options": { "A": "1/5", "B": "1/10", "C": "1/15", "D": "1/20" },
      "correct_answer": "B"
    },
    {
      "id": 2,
      "difficulty": "easy",
      "question": "👷 A does 1/4 work in 1 day. Days to complete?",
      "options": { "A": 2, "B": 3, "C": 4, "D": 5 },
      "correct_answer": "C"
    },
    {
      "id": 3,
      "difficulty": "easy",
      "question": "🏗️ A and B together do work in 6 days. If A alone does in 12 days, B alone in ___ days.",
      "options": { "A": 6, "B": 8, "C": 10, "D": 12 },
      "correct_answer": "D"
    },
    {
      "id": 4,
      "difficulty": "easy",
      "question": "📅 5 workers finish in 20 days. 10 workers finish in ___ days.",
      "options": { "A": 8, "B": 10, "C": 12, "D": 15 },
      "correct_answer": "B"
    },
    {
      "id": 5,
      "difficulty": "easy",
      "question": "⏳ A's 1 day work = 1/8. B's 1 day work = 1/12. Together 1 day work?",
      "options": { "A": "1/20", "B": "5/24", "C": "1/10", "D": "7/24" },
      "correct_answer": "B"
    },
    {
      "id": 6,
      "difficulty": "easy",
      "question": "👷 If 8 men do work in 9 days, 1 man does in ___ days.",
      "options": { "A": 64, "B": 70, "C": 72, "D": 80 },
      "correct_answer": "C"
    },
    {
      "id": 7,
      "difficulty": "easy",
      "question": "🏗️ A can do in 15 days, B in 10 days. Together days?",
      "options": { "A": 5, "B": 6, "C": 7, "D": 8 },
      "correct_answer": "B"
    },
    {
      "id": 8,
      "difficulty": "easy",
      "question": "📅 12 workers finish in 18 days. 18 workers finish in ___ days.",
      "options": { "A": 10, "B": 11, "C": 12, "D": 13 },
      "correct_answer": "C"
    },
    {
      "id": 9,
      "difficulty": "easy",
      "question": "⏱️ A's efficiency is twice B's. If B takes 20 days, A takes ___ days.",
      "options": { "A": 5, "B": 8, "C": 10, "D": 12 },
      "correct_answer": "C"
    },
    {
      "id": 10,
      "difficulty": "easy",
      "question": "👷 4 women finish in 12 days. 6 women finish in ___ days.",
      "options": { "A": 6, "B": 7, "C": 8, "D": 9 },
      "correct_answer": "C"
    },
    {
      "id": 11,
      "difficulty": "easy",
      "question": "🏗️ A+B do in 8 days, A alone in 12 days. B alone days?",
      "options": { "A": 20, "B": 22, "C": 24, "D": 26 },
      "correct_answer": "C"
    },
    {
      "id": 12,
      "difficulty": "easy",
      "question": "📅 If 1/3 work done in 4 days, full work in ___ days.",
      "options": { "A": 8, "B": 10, "C": 12, "D": 14 },
      "correct_answer": "C"
    },
    {
      "id": 13,
      "difficulty": "easy",
      "question": "⏳ A does 1/6 work/day, B does 1/9 work/day. Together days?",
      "options": { "A": "3.4", "B": "3.6", "C": "3.8", "D": "4.0" },
      "correct_answer": "B"
    },
    {
      "id": 14,
      "difficulty": "easy",
      "question": "👷 6 boys finish in 15 days. 10 boys finish in ___ days.",
      "options": { "A": 7, "B": 8, "C": 9, "D": 10 },
      "correct_answer": "C"
    },
    {
      "id": 15,
      "difficulty": "easy",
      "question": "🏗️ A+B = 1/10 work/day, A=1/15 work/day. B alone days?",
      "options": { "A": 20, "B": 25, "C": 30, "D": 35 },
      "correct_answer": "C"
    },
    {
      "id": 16,
      "difficulty": "easy",
      "question": "📅 20 workers → 30 days. 25 workers → ___ days.",
      "options": { "A": 22, "B": 24, "C": 26, "D": 28 },
      "correct_answer": "B"
    },
    {
      "id": 17,
      "difficulty": "easy",
      "question": "⏱️ 1 man = 2 women. 6 men finish in 10 days. 12 women finish in ___ days.",
      "options": { "A": 8, "B": 9, "C": 10, "D": 12 },
      "correct_answer": "C"
    },
    {
      "id": 18,
      "difficulty": "easy",
      "question": "👷 A can do 1/5 work in 2 days. Full work in ___ days.",
      "options": { "A": 8, "B": 9, "C": 10, "D": 12 },
      "correct_answer": "C"
    },
    {
      "id": 19,
      "difficulty": "easy",
      "question": "🏗️ A+B do 1/8 work/day. A does 1/12 work/day. B alone days?",
      "options": { "A": 20, "B": 22, "C": 24, "D": 26 },
      "correct_answer": "C"
    },
    {
      "id": 20,
      "difficulty": "easy",
      "question": "📅 16 workers → 21 days. 28 workers → ___ days.",
      "options": { "A": 10, "B": 11, "C": 12, "D": 14 },
      "correct_answer": "C"
    },
    {
      "id": 21,
      "difficulty": "medium",
      "question": "⏱️ A does work in 20 days, B in 30 days. Together for 4 days, then B leaves. A finishes in ___ more days.",
      "options": { "A": 10, "B": "10.67", "C": "11.33", "D": 12 },
      "correct_answer": "B"
    },
    {
      "id": 22,
      "difficulty": "medium",
      "question": "👷 15 men finish in 24 days. After 6 days, 5 men leave. Total days?",
      "options": { "A": 28, "B": 30, "C": 32, "D": 34 },
      "correct_answer": "B"
    },
    {
      "id": 23,
      "difficulty": "medium",
      "question": "🏗️ A+B do in 12 days, B+C in 15 days, A+C in 20 days. A alone days?",
      "options": { "A": 20, "B": 25, "C": 30, "D": 35 },
      "correct_answer": "C"
    },
    {
      "id": 24,
      "difficulty": "medium",
      "question": "📅 10 workers start, after 8 days 4 more join. Total work in 30 days. How many workers from start to finish same work in 20 days?",
      "options": { "A": 12, "B": 14, "C": 16, "D": 18 },
      "correct_answer": "D"
    },
    {
      "id": 25,
      "difficulty": "medium",
      "question": "⏳ A is twice as efficient as B. Together in 10 days. B alone days?",
      "options": { "A": 20, "B": 25, "C": 30, "D": 35 },
      "correct_answer": "C"
    },
    {
      "id": 26,
      "difficulty": "medium",
      "question": "👷 18 women finish in 25 days. After 10 days, 6 women leave. Total days?",
      "options": { "A": 30, "B": 32, "C": 34, "D": 36 },
      "correct_answer": "C"
    },
    {
      "id": 27,
      "difficulty": "medium",
      "question": "🏗️ A does 1/3 work in 5 days, B does 1/4 in 6 days. Together days?",
      "options": { "A": "7.2", "B": "7.5", "C": "7.8", "D": "8.0" },
      "correct_answer": "A"
    },
    {
      "id": 28,
      "difficulty": "medium",
      "question": "📅 24 men finish in 20 days. After 8 days, 8 men leave. Total days?",
      "options": { "A": 24, "B": 26, "C": 28, "D": 30 },
      "correct_answer": "C"
    },
    {
      "id": 29,
      "difficulty": "medium",
      "question": "⏱️ A+B do in 8 days, B+C in 10 days, A+C in 12 days. B alone days?",
      "options": { "A": "120/7", "B": "120/11", "C": "120/13", "D": "120/17" },
      "correct_answer": "D"
    },
    {
      "id": 30,
      "difficulty": "medium",
      "question": "👷 30 workers finish in 16 days. After 4 days, 6 workers leave. After 6 more days, 10 workers added. Total days?",
      "options": { "A": 18, "B": 20, "C": 22, "D": 24 },
      "correct_answer": "B"
    },
    {
      "id": 31,
      "difficulty": "medium",
      "question": "🏗️ A does 40% work in 12 days, B does 60% in 18 days. Together days?",
      "options": { "A": "15.5", "B": "16.2", "C": "16.8", "D": "17.5" },
      "correct_answer": "C"
    },
    {
      "id": 32,
      "difficulty": "medium",
      "question": "📅 16 men or 24 women finish in 20 days. 12 men and 8 women together days?",
      "options": { "A": 16, "B": 18, "C": 20, "D": 22 },
      "correct_answer": "C"
    },
    {
      "id": 33,
      "difficulty": "medium",
      "question": "⏳ A+B do 3/4 work in 9 days. A alone does 1/2 in 10 days. B alone days?",
      "options": { "A": 30, "B": 32, "C": 36, "D": 40 },
      "correct_answer": "C"
    },
    {
      "id": 34,
      "difficulty": "medium",
      "question": "👷 20 men finish in 15 days. After 5 days, 5 men leave. After 5 more days, 5 men join. Total days?",
      "options": { "A": 18, "B": 19, "C": 20, "D": 21 },
      "correct_answer": "C"
    },
    {
      "id": 35,
      "difficulty": "medium",
      "question": "🏗️ A does 1/5 in 4 days, B does 1/6 in 5 days. Together days?",
      "options": { "A": "9.23", "B": "9.6", "C": "10.2", "D": "10.8" },
      "correct_answer": "A"
    },
    {
      "id": 36,
      "difficulty": "medium",
      "question": "📅 12 workers finish in 30 days. After 10 days, 4 workers leave. After 10 more days, 6 workers added. Total days?",
      "options": { "A": 28, "B": 30, "C": 32, "D": 34 },
      "correct_answer": "B"
    },
    {
      "id": 37,
      "difficulty": "medium",
      "question": "⏱️ A is 50% more efficient than B. B takes 18 days. A alone days?",
      "options": { "A": 10, "B": 11, "C": 12, "D": 13 },
      "correct_answer": "C"
    },
    {
      "id": 38,
      "difficulty": "medium",
      "question": "👷 25 men finish in 20 days. After 8 days, 5 men leave. After 6 more days, 10 men join. Total days?",
      "options": { "A": 22, "B": 24, "C": 26, "D": 28 },
      "correct_answer": "B"
    },
    {
      "id": 39,
      "difficulty": "medium",
      "question": "🏗️ A+B do in 6 days, A+C in 8 days, B+C in 10 days. C alone days?",
      "options": { "A": "120/7", "B": "120/11", "C": "120/13", "D": "120/17" },
      "correct_answer": "B"
    },
    {
      "id": 40,
      "difficulty": "medium",
      "question": "📅 18 women finish in 28 days. After 7 days, 3 women leave. After 7 more days, 5 women join. Total days?",
      "options": { "A": 30, "B": 32, "C": 34, "D": 36 },
      "correct_answer": "C"
    },
    {
      "id": 41,
      "difficulty": "hard",
      "question": "⏱️ A does work in 15 days, B in 20 days. They start together, but A leaves after 3 days. B works 2 days, then A returns. Total days?",
      "options": { "A": "9.8", "B": "10.2", "C": "10.6", "D": "11.0" },
      "correct_answer": "B"
    },
    {
      "id": 42,
      "difficulty": "hard",
      "question": "👷 30 men finish in 24 days. After 6 days, 10 men leave. After 8 more days, 15 men join. Total days?",
      "options": { "A": 26, "B": 28, "C": 30, "D": 32 },
      "correct_answer": "B"
    },
    {
      "id": 43,
      "difficulty": "hard",
      "question": "🏗️ A+B do 70% work in 14 days, B+C do 50% in 10 days, A+C do 60% in 12 days. A alone days?",
      "options": { "A": 30, "B": 35, "C": 40, "D": 45 },
      "correct_answer": "C"
    },
    {
      "id": 44,
      "difficulty": "hard",
      "question": "📅 24 men or 36 women finish in 30 days. 18 men start, after 10 days 6 men replaced by women. Total days?",
      "options": { "A": 32, "B": 34, "C": 36, "D": 38 },
      "correct_answer": "D"
    },
    {
      "id": 45,
      "difficulty": "hard",
      "question": "⏳ A is 25% more efficient than B, B is 20% more efficient than C. C takes 30 days. A alone days?",
      "options": { "A": 16, "B": 18, "C": 20, "D": 22 },
      "correct_answer": "C"
    },
    {
      "id": 46,
      "difficulty": "hard",
      "question": "👷 40 workers finish in 18 days. After 6 days, 10 workers leave. After 6 more days, 15 workers added. Total days?",
      "options": { "A": 20, "B": 22, "C": 24, "D": 26 },
      "correct_answer": "B"
    },
    {
      "id": 47,
      "difficulty": "hard",
      "question": "🏗️ A does 1/2, B does 1/3, C does rest in 5 days. A+B+C together days?",
      "options": { "A": "6", "B": "7", "C": "8", "D": "9" },
      "correct_answer": "A"
    },
    {
      "id": 48,
      "difficulty": "hard",
      "question": "📅 16 men or 20 women finish in 25 days. 12 men and 10 women work for 10 days, then 4 men leave and 5 women join. Total days?",
      "options": { "A": 18, "B": 20, "C": 22, "D": 24 },
      "correct_answer": "C"
    },
    {
      "id": 49,
      "difficulty": "hard",
      "question": "⏱️ A+B do in 9 days, B+C in 12 days, C+A in 18 days. All three together days?",
      "options": { "A": "6", "B": "7", "C": "8", "D": "9" },
      "correct_answer": "C"
    },
    {
      "id": 50,
      "difficulty": "hard",
      "question": "👷 50 workers finish in 24 days. After 8 days, 10 workers leave. After 8 more days, 20 workers added. Total days?",
      "options": { "A": 26, "B": 28, "C": 30, "D": 32 },
      "correct_answer": "B"
    },
    {
      "id": 51,
      "difficulty": "hard",
      "question": "🏗️ A does 20% in 4 days, B does 25% in 5 days, C does 30% in 6 days. Together days?",
      "options": { "A": "8.33", "B": "8.57", "C": "8.75", "D": "9.00" },
      "correct_answer": "B"
    },
    {
      "id": 52,
      "difficulty": "hard",
      "question": "📅 15 men or 25 boys finish in 40 days. 10 men and 15 boys work for 15 days, then 5 men and 5 boys leave. Total days?",
      "options": { "A": 45, "B": 48, "C": 50, "D": 52 },
      "correct_answer": "B"
    },
    {
      "id": 53,
      "difficulty": "hard",
      "question": "⏳ A+B do 3/5 in 12 days, B+C do 1/2 in 10 days, A+C do 2/3 in 15 days. B alone days?",
      "options": { "A": 30, "B": 35, "C": 40, "D": 45 },
      "correct_answer": "C"
    },
    {
      "id": 54,
      "difficulty": "hard",
      "question": "👷 36 workers finish in 20 days. After 5 days, 6 workers leave. After 5 more days, 12 workers added. Total days?",
      "options": { "A": 22, "B": 24, "C": 26, "D": 28 },
      "correct_answer": "B"
    },
    {
      "id": 55,
      "difficulty": "hard",
      "question": "🏗️ A does 1/4 in 6 days, B does 1/5 in 8 days, C does 1/6 in 9 days. Together days?",
      "options": { "A": "12.6", "B": "13.2", "C": "13.8", "D": "14.4" },
      "correct_answer": "B"
    },
    {
      "id": 56,
      "difficulty": "hard",
      "question": "📅 20 men or 30 women finish in 25 days. 12 men and 18 women work for 10 days, then 4 men and 6 women leave. Total days?",
      "options": { "A": 28, "B": 30, "C": 32, "D": 34 },
      "correct_answer": "B"
    },
    {
      "id": 57,
      "difficulty": "hard",
      "question": "⏱️ A+B do in 10 days, B+C in 15 days, A+C in 12 days. A+B+C together days?",
      "options": { "A": "6", "B": "7", "C": "8", "D": "9" },
      "correct_answer": "C"
    },
    {
      "id": 58,
      "difficulty": "hard",
      "question": "👷 48 workers finish in 15 days. After 5 days, 12 workers leave. After 5 more days, 18 workers added. Total days?",
      "options": { "A": 18, "B": 20, "C": 22, "D": 24 },
      "correct_answer": "B"
    },
    {
      "id": 59,
      "difficulty": "hard",
      "question": "🏗️ A is twice B, B is thrice C. Together in 5 days. A alone days?",
      "options": { "A": "8.33", "B": "9.17", "C": "10.25", "D": "11.5" },
      "correct_answer": "B"
    },
    {
      "id": 60,
      "difficulty": "hard",
      "question": "📅 25 men or 35 women finish in 30 days. 15 men and 20 women work for 12 days, then 5 men leave and 10 women join. Total days?",
      "options": { "A": 28, "B": 30, "C": 32, "D": 34 },
      "correct_answer": "B"
    }
  ]
}