Q. 224.5( 2 Votes )

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Answer :

Working 7 hours a day 147 m long trench can be dug by 10 men.


Working 1 hour a day 147 m long trench can be dug by


= 10 x 7 = 70


Working 1 hour a day 1 m long trench can be dug by


Working 8 hours a day 1 m long trench can be dug by


Working 8 hours a day 160 m long trench can be dug by


= 9.523


As the men cannot be in decimal or fraction, so, rounding off we get 10 men.


So, it would take 10 men working 8hr a day to dug 160m trench.


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RS Aggarwal - Mathematics