A&B together can finish a piece of work in 12 days if A alone can finish the same work in 20days in how many days B alone can finish it?
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A and B can finish the work in day =1/12work
A can finish the same work in 1 day=1/20 work
B can finish the same work in one day=1/2-1/20=1/30 work
Bcan finish the total work=30 days
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