X can finish a work in 20 days. Y can finish the same work in 15 days. Yworked for 9 days and left the job. how many days does X alone need to finish the remaining work?\nOptions:\n(A) 3\n(B) 5\n(C) 6\n(D) 8\n(E) 9 Hmmm, my stream of consciousness:
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Work done by X in 1 day = 1/20\nWork done by Y in 1 day = 1/15\nWork done by Y in 9 days = 9/15 = 3/5\nRemaining work = 1 – 3/5 = 2/5\nNumber of days in which X can finish the remaining work = (2/5) / (1/20) = 8 So, the answer is (D).
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