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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?

40
50
54
60
Explanation:

A and B together complete the work in 30 days.

So, work done by A and B together in 1 day = 1/30

=> Work done by A and B together in 20 days = 20/30 = 2/3

So work remaining after 20 days when B leaves = 1 - 2/3 = 1/3

Given that A completes the remaining work in 20 days

=> A completes 1/3 work in 20 days

=> A completes the work in 20 $\times$ 3 = 60 days.

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