A and B can do a piece of work in 12 days, B and C in 15 days, and C and A in 20 days. If A, B and C work together, in how many days will they complete the work? MCQ with Answer and Explanation
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Question #1
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A can complete a work in 19 days and B can complete the same work in 24 days. If they work together, in how many days will the work be completed?
Correct Answer: Option B
Explanation:
Combined rate = 1/19 + 1/24. Time = 1 ÷ combined rate = 10.6 days.
Combined rate = 1/19 + 1/24. Time = 1 ÷ combined rate = 10.6 days.
This question belongs to:
Maths
Time and Work
Question #2
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9 men can complete a work in 19 days. If 13 men work at the same rate, in how many days will the work be completed?
Correct Answer: Option A
Explanation:
Total work = 9 × 19 = 171 man-days. Required days = 171/13 = 13.15 days.
Total work = 9 × 19 = 171 man-days. Required days = 171/13 = 13.15 days.
This question belongs to:
Maths
Time and Work
Question #3
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A and B work together. A alone can complete the work in 24 days and B alone in 26 days. What percentage of the total daily work is contributed by A?
Correct Answer: Option C
Explanation:
A share = (1/24) / (1/24+1/26) ×100 = 52.0%.
A share = (1/24) / (1/24+1/26) ×100 = 52.0%.
This question belongs to:
Maths
Time and Work
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