SOLUTION: If 6 men can do piece of work in 20days,how many extra men should engaged to do job in 15 days?

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Question 926422: If 6 men can do piece of work in 20days,how many extra men should engaged to do job in 15 days?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
r, the work rate for 1 man. The same 1 job is to be done in either case.

Let n be the number of additional men.
highlight%286r%2A20=%286%2Bn%29r15%29; and just solve for n.