SOLUTION: Certain men can complete a work in 160 days .If there were 10 men more,the work would have been complete in 20 days less.How many men were there?

Question 975774: Certain men can complete a work in 160 days .If there were 10 men more,the work would have been complete in 20 days less.How many men were there?
Answer by josgarithmetic(39631) (Show Source): You can put this solution on YOUR website!
n, certain quantity of men to do work.
nr, the rate for n men to do work.

, one job complete.

Ten more men:

System of Equations:

You can solve and substitute for nr, first to find r.

;

-----now the rate of one man is known.

Return to the first equation, .
Solve for n, how many men.
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