A contractor undertook to dig a canal in 72 days. He employed 70 men to dig it. How many extra Men should he employ in order to complete the work in 56 days?
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Answer:
70 men can dig a canal= 72 days
no of men to dig in one day= 70×72=5040
no of men required to dig in 56 days= 5040/56=90
extra men required= 90-70=20
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