A can do a job in 12 days and B can do it in 20 days. A and B working together will finish twice the amount of work in days?\nOptions:\n(A) 22 1/6\n(B) 22 1/2\n(C) 22 1/0\n(D) 15\n(E) 22 1/1 Hmmm, my stream of consciousness:
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1/12 + 1/20 = 8/60 = 2/15\n15/2 = 15/2 *2 = 15 days So, the answer is (D).
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