If A and B together can complete a piece of work in 15 days and B alone in 20 days, in how many days can A alone complete the work?

40 30 45 60

Your Answer

A+B=15 days
B=20 days
Total work=60
Therefore,
A+B=60/15=4 units/days  -------------(1)
B=3 units/days ---------------------------(2)
hence,
A can does 1 unit per days ----------from 1 and 2
therefore,
A can be able to do work in 60/1 = 60 days

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