Q: A and B together can do a work in 6 days. If A alone can do it in 15 days. In how many days can B alone do it?
Options:
(A) 7
(B) 13
(C) 19
(D) 10
(E) None Let's give some random thoughts before answering.
1/6 1/15 = 1/10
B can do the work in 10 days
Therefore, the answer is (D).