A can do a work in 9 days and B can do the same work in 27 days. If they work together, in how many days will they complete the work?\nOptions:\n(A) 6 3/4 days\n(B) 7 3/4 days\n(C) 5 3/4 days\n(D) 6 1/4 days\n(E) 6 2/4 days Think first, then make a decision. Some random thoughts:
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One day's work of A and B = 1/9 + 1/27 = (3+1)/27 = 4/27 So, the time taken to complete the work is 6 3/4 days. So the answer is (A).
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