If A can do a piece of work in 20 days and B can do it in 30 days, how much work will they complete

A. 1/6

B. 1/5

C. 1/4

D. 1/3

E. None of the above

Answer: A. 1/6

A's work rate is 1/20 and B's is 1/30. Together, they complete 1/20 + 1/30 = 1/12 of the work in a day. In 5 days, they complete 5/12 of the work.

Posted in: Time & Work - Aptitude - Mathematics