A can do a job in 18 days and B can do it in 30 days. A and B working together will finish twice the amount of work in ------- days?
Options:
(A) 21 days
(B) 22 days
(C) 23 days
(D) 12 days
(E) none of these Stream of consciousness:
1/18 + 1/30 = 8/90 = 4/45
45/4 = 11 *2 = 22 days
Thus, the answer is (B).