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?

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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) About Me  (Show Source):
You can put this solution on YOUR website!
b bags of the 10% cement, 1 bag of 18% cement.

%2810b%2B1%2A18%29%2F%28b%2B1%29=11

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