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Question

A isfive times as efficient as B and can finish a piece of work in 36 days less than B. B can finish this work in how many days?

A 40 days Correct Answer Incorrect Answer
B 42 days Correct Answer Incorrect Answer
C 52 days Correct Answer Incorrect Answer
D 45 days Correct Answer Incorrect Answer

Solution

Ratio of efficiencyof A and B = 5: 1
A will take 1/5 of time as compared to B.
Say, B takes 5x days and A takes x days.
∴ 5x – x = 36 ⇒ x = 9
∴ B takes 9 × 5 = 45 days to do the work.

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