If 8 men can do a work in 15days then the same work can be done by how many men in20 days
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8 men can do a piece of work in 15 days .
1 man can do a piece of work in 15÷8 days .
20 men can do a piece of work in 15÷8/20 days = 6 days
then , 20 men can do the work in 6 days.
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