Explain simply why (B) is the correct answer to: 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) 22 1/8
(B) 22 1/2
(C) 22 1/1
(D) 22 1/5
(E) 22 1/9. Explanation:
1/18 + 1/30 = 8/90 = 4/45
45/4 = 11 *2 = 22 1/2 days