A can complete a work in 8 days and B in 29 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 and B can complete a piece of work in 20 days and 30 days respectively. If they work on alternate days starting with B, in how many days will the work be finished?
Correct Answer: Option C
Explanation:
Total work = LCM(20, 30) = 60 units. Efficiency of A = 3, B = 2. In 2 days (B then A), work completed = 2 + 3 = 5 units. Time taken to complete 60 units = (60 / 5) * 2 = 24 days.
Total work = LCM(20, 30) = 60 units. Efficiency of A = 3, B = 2. In 2 days (B then A), work completed = 2 + 3 = 5 units. Time taken to complete 60 units = (60 / 5) * 2 = 24 days.
This question belongs to:
Maths
Time and Work
Question #2
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A can complete a work in 17 days and B in 24 days. If they work together, the work will be completed in:
Correct Answer: Option C
Explanation:
Combined rate = 1/17 + 1/24. Required time = 9.95 days.
Combined rate = 1/17 + 1/24. Required time = 9.95 days.
This question belongs to:
Maths
Time and Work
Question #3
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A can complete a work in 20 days. What percentage of the work will be completed in 7 days?
Correct Answer: Option A
Explanation:
Completed percentage = (7/20)×100 = 35.0%.
Completed percentage = (7/20)×100 = 35.0%.
This question belongs to:
Maths
Time and Work
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