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?

Answers (1)

In one day A+B can work =1/30 part of the work 

In 20 days A+B can work =20/30 = 2/3 part of the work 

Remianing work =1/3 part of the work

1/3 part of work done by A in = 20 days

Total work done by A in = 20x3 = 60 days 

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