A and B do piece of work in 12 day s but A alone can do that work in 20 day so how many dayst B can do that work
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a+b do the the work in 12 days
so.. the do 1/12work ih one day
a do the work in 20 days
so. a do 1/20work in 1 days
..b do (1/12-1/20) work in 1 day
=1/30 work
so b do the work in 30 days
so.. the do 1/12work ih one day
a do the work in 20 days
so. a do 1/20work in 1 days
..b do (1/12-1/20) work in 1 day
=1/30 work
so b do the work in 30 days
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