16 men can complete a piece of work in 7 days. In how many days will 28 men complete the same work ?
The number of days 16 men take to complete a piece of work is 7 days.
Hence, the number of days it takes 1 man to complete the piece of work is 7*16 = 112 days.
So, the number of days it takes 28 men to complete the piece of work is $$\frac{112}{28} = 4$$ days
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