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Question

A is thrice as efficient as B and can finish a piece of work in 20 days less than B. B can finish this work in how many days?

A 50 days Correct Answer Incorrect Answer
B 30 days Correct Answer Incorrect Answer
C 22 days Correct Answer Incorrect Answer
D 20 days Correct Answer Incorrect Answer

Solution

Ratio of efficiencyof A and B = 3: 1
A will take 1/3 of time as compared to B.
Say, B takes 3x days and A takes x days.
∴ 3x – x = 20 ⇒ x = 10
∴ B takes 10 × 3 = 30 days to do the work.

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