A can complete a work in 19 days and B in 30 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 is thrice as efficient as B. Working together, they can complete a piece of work in 18 days. In how many days can A alone complete the work?
Correct Answer: Option B
Explanation:
Let B's efficiency = 1, then A's efficiency = 3. Combined efficiency = 3 + 1 = 4. Total work = 18 * 4 = 72 units. Time taken by A alone = 72 / 3 = 24 days.
Let B's efficiency = 1, then A's efficiency = 3. Combined efficiency = 3 + 1 = 4. Total work = 18 * 4 = 72 units. Time taken by A alone = 72 / 3 = 24 days.
This question belongs to:
Maths
Time and Work
Question #2
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A can complete a work in 16 days and B in 32 days. After working together for 5 days, what percentage of work remains?
Correct Answer: Option A
Explanation:
Remaining work = (1 - 5*(1/16+1/32))×100 = 53.12%.
Remaining work = (1 - 5*(1/16+1/32))×100 = 53.12%.
This question belongs to:
Maths
Time and Work
Question #3
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A can complete a work in 15 days and B in 30 days. After working together for 5 days, what percentage of work remains?
Correct Answer: Option B
Explanation:
Remaining work = (1 - 5*(1/15+1/30))×100 = 50.0%.
Remaining work = (1 - 5*(1/15+1/30))×100 = 50.0%.
This question belongs to:
Maths
Time and Work
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