Question: A can do a piece of work in 20 days. B in 15 days A and C in 12 days. In how many days can A finish the work if he is assisted by B on one day and C on the next, alternately?\nOptions:\n(A) 9 days\n(B) 8 days\n(C) 5 days\n(D) 54 days\n(E) 2 days Random thoughts:
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A + B = 1/20 + 1/15 = 7/60\nA + C = 1/20 + 1/12 = 8/60\n7/60 + 8/60 = 15/60 = 1/4\n4 days * 2 = 8 days The final answer: (B).
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