SOLUTION: A contractor mixes concrete from bags of pre-mix for small jobs. How many bags with 7% cement should he mix with 10 bags of 15.5% cement to produce a mix containing 12% cement?

Question 324939: A contractor mixes concrete from bags of pre-mix for small jobs. How many bags with 7% cement should he mix with 10 bags of 15.5% cement to produce a mix containing 12% cement?
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Let the number of 7% bags be Y.

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7 bags of 7% cement need to be added.
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