SOLUTION: A contractor mixes concrete from bags of pre-mix for small jobs. How many bags with 10% cement should he mix with 1 bags of 18% cement to produce a mix containing 11% cement?

Question 958679: A contractor mixes concrete from bags of pre-mix for small jobs. How many bags with 10% cement should he mix with 1 bags of 18% cement to produce a mix containing 11% cement?
Answer by josgarithmetic(39620) (Show Source): You can put this solution on YOUR website!
b bags of the 10% cement, 1 bag of 18% cement.

If or when that equation makes sense, the rest of the work is just number properties mechanics.
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