X can finish a work in 20 days. Y can finish the same work in 16 days. Y worked for 12 days and left the job. how many days does X alone need to finish the remaining work?\nOptions:\n(A) 2\n(B) 3\n(C) 9\n(D) 5\n(E) 8 OK. Let's think. Some random thoughts first:
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Work done by X in 1 day = 1/20\nWork done by Y in 1 day = 1/16\nWork done by Y in 12 days = 12/16 = 3/4\nRemaining work = 1 – 3/4 = 1/4\nNumber of days in which X can finish the remaining work = (1/4) / (1/20) = 5 The answer: (D).
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