if 60 men can finish a piece of work in 25 days hoe many days will 15 men take to do it
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that is, 60 men needed to finish a piece of work in=25 days
then, 1 men needed to finish a piece of work in = 25*60
there fore, 15 man needed to finish a piece of work in = 25*60/15
= 25*4
= 100 days
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