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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?


In one day, A+B=1/30...in 20 days, 20*(1/30) i.e 2/3 of the work. Therefore 1/3 of the work is left. A finished 1/3 of work in 20 days 20 days -----1/3 =1 day------1/20*3 =1 day ------1/60 of work Therefore A will complete the work in 60 days.
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