Student: A can do a job in 20 days and B can do it in 30 days. A and B working together will finish twice the amount of work in days?\nOptions:\n(A) 22 1/6\n(B) 24\n(C) 22 1/0\n(D) 22 1/9\n(E) 22 1/1.
Another student: Let's say, hmmm...

User
1/20 + 1/30 = 5/60 = 1/12\n12 = 12 *2 = 24 days Final answer: (B).
Assistant