Student: A can do a job in 18 days and B can do it in 24 days. A and B working together will finish twice the amount of work in days?\nOptions:\n(A) 22 1/6\n(B) 22 1/2\n(C) 20 4/7\n(D) 22 1/9\n(E) 22 1/1.
Another student: Let's say, hmmm...

User
1/18 + 1/24 = 7/72\n72/7 = 72/7 *2 = 20 4/7 days Final answer: (C).
Assistant