SOLUTION: Working 8 hours daily, 40 people can dig the foundation of a building in 21 days. Working for 10 hours daily if the work is to be finished in 14 days, how many people are needed to

Question 903733: Working 8 hours daily, 40 people can dig the foundation of a building in 21 days. Working for 10 hours daily if the work is to be finished in 14 days, how many people are needed to finish the same work?
This is from the chapter Direct and Inverse proportion for Grade VIII. Cannot seem to get the concept of having 3 variables.
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
8*40*21=6720 man hours
10*14=140
6720/140=48
48 men needed to do the job in 14 days working 10 hours a day!

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