A can do a piece of work in 15 days and B can finish it in 20 days. They work together for 5 days and then A leaves. In how many days will B finish the remaining work?
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A one day work=1/15
B one day work =1/20
they work together for 5 days
5 day work is =5(1/15 +1/20)
=5(4+3/60)
=7/12
work left =1-7/12=5/12
B will finish =5/12/1/20
=100/12=25/3days
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