A can do a piece of work in 20 days, B can do it in 30 days. If they work together for 10 days, how

A. 1/3

B. 1/2

C. 1/4

D. 1/5

E. None of the above

Answer: A. 1/3

In 10 days, A does 1/2 of the work and B does 1/3 of the work. Together they complete 5/6 of the work, leaving 1/6.

Posted in: Time & Work - Aptitude - Mathematics