A can do 1/10th of piece of work in a day .B can do the same work in 15 day.In how many day can they do the same work ,working together ?
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A can do a work in a day =1/10
B can do a work in a day = 1/15
A and B can do the work together = 1/10+1/15
=5/30
= 1/7
they both can do the work in 7 days
hope it will help u.
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