A and B can complete a work in 20 days and 30 days respectively. If they work together for 10 days,

A. 1/3

B. 1/4

C. 1/2

D. 1/5

E. None of the above

Answer: A. 1/3

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

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