if 30 men can finish a piece of work in 25 days, how many days will 15 men take to do it ?
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Given, 36 men can finish a piece of work in 25 days
=> The number of man-days = 36*25 = 900
Let x be the number of days taken by the 15 men to do the piece of work
=> The number of man-days = 15x
But the number of man-days remains constant.
=> 15x = 900
x = 900/15 = 60
=> 15 men take 60 days to complete the piece of work.
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