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A is twice as good a workman as B and together they finish a piece of work in 14 days. In how many days can a alone finish the work?

18
20
21
24

Correct Answer: 21

Explanation:

One day's work of A and B = 1/x + 1/2x = 1/14
∴ x = 21
Since A is twice efficient as B so A will take half of the day taken by B.

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