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How do you work this out?

4 men 8hrs to build a wall, how long would it take 7 men to build same wall?

If 4 men take 8 hours then you must first work out how long it takes 1 man. 1 man will take 4 x 8 = 32 hours. Now we work out how many hours it will take for 7 men. The calculation involved here will be 32/7 = 4.57 hours
31 January 2011
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