A can complete a work in 9 days and B in 24 days. If they work together, the work will be completed in: MCQ with Answer and Explanation
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Question #1
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A can complete a work in 20 days and B can complete the same work in 15 days. If they work together, in how many days will the work be completed?
Correct Answer: Option C
Explanation:
Combined rate = 1/20 + 1/15. Time = 1 รท combined rate = 8.57 days.
Combined rate = 1/20 + 1/15. Time = 1 รท combined rate = 8.57 days.
This question belongs to:
Maths
Time and Work
Question #2
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A can complete a work in 25 days and B in 25 days. If both work together, in how many days will the work be completed?
Correct Answer: Option D
Explanation:
Combined rate = 1/25 + 1/25. Time = 12.5 days.
Combined rate = 1/25 + 1/25. Time = 12.5 days.
This question belongs to:
Maths
Time and Work
Question #3
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If 5 men or 9 women can do a piece of work in 19 days, then 3 men and 6 women will do the same work in:
Correct Answer: Option A
Explanation:
5 Men = 9 Women => 1 Man = 9/5 Women. 3 men + 6 women = 3 * (9/5) + 6 = 27/5 + 6 = 57/5 women. Since 9 women take 19 days, 57/5 women will take (9 * 19) / (57/5) = (171 * 5) / 57 = 3 * 5 = 15 days.
5 Men = 9 Women => 1 Man = 9/5 Women. 3 men + 6 women = 3 * (9/5) + 6 = 27/5 + 6 = 57/5 women. Since 9 women take 19 days, 57/5 women will take (9 * 19) / (57/5) = (171 * 5) / 57 = 3 * 5 = 15 days.
This question belongs to:
Maths
Time and Work
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