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A and B together can do a piece of work in 12 days, while B alone can finish it in 30 days. A alone can finish the work in?

15 days
18 days
20 days
25 days

Correct Answer: 20 days

Explanation:

(A + B)'s 1 days work = 1/12
B's 1 days work = 1/30
∴ A's 1 days work = 1/12 - 1/30 = (5 - 2)/60 = 1/20
∴ A alone can finish the work in 20 days.

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