Question discussion

A is twice as efficient as B. Together they can finish a piece of work in 18 days. In how many days can A alone finish the work?

Correct answer: D

Explanation

With efficiencies 2 and 1 the total work is 18 × 3 = 54 units, and A alone does 2 units a day, so he takes 54 / 2 = 27 days.

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