8 men can do a piece of work in 15 days. Let's find in how many men finish the same work.
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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
20 men do the same work in 6 days
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