A does a work in 10 days and B does the same work in 15 days. In how many days they together will do the same work?\nOptions:\n(A) 1\n(B) 6\n(C) 7\n(D) 5\n(E) 43 Let's think first. Stream of consciousness:
User
A's 1 day work = 1/10; B's 1 day work = 1/15\n(A + B)'s 1 day work = (1/10 + 1/15) = 1/6\nSo, both together will finish the work in 6 days.
So, the answer is (B).
Assistant