1 MB together can finish a piece of work of in 12 days if a alone can finish the same work in 20 days in how many days b alone can finish it
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a can do work in 20 days
total work of a = 20 days
=1×20 days
then the fraction or part of work done by a in 1 day is 1/20
same like that..
total work done by both is in 12 days
1 day they can complete 1/12 th work
so b 1 day work =ab 1 day work-a i day work
=1/12-1/20
=2/60=1/30
b 1 day work =1/30
then b total work =30 days
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