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A and B can together finish a work 30 days. They worked together for 20 days and then B left. After another 20 days, A finished the remaining work. In how many days A alone can finish the work?

Correct Answer: 60

Explanation:


(A + B)'s 20 day's work = 1 x 20 = 2 .
30 3



Remaining work = 1 - 2 = 1 .
3 3



Now, 1 work is done by A in 20 days.
3


Therefore, the whole work will be done by A in (20 x 3) = 60 days.


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