SOLUTION: a contractor mixes concrete from bags of pre-mix for small jobs. How many bags with 8% cement should he mix with 6 bags of 16% cement to produce a mix containing 11% cement?

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Question 246603: a contractor mixes concrete from bags of pre-mix for small jobs. How many bags with 8% cement should he mix with 6 bags of 16% cement to produce a mix containing 11% cement?


a. 16 bags b. 12 bags c. 10 bags d. 21 bags
Answer by edjones(8007) About Me  (Show Source):
You can put this solution on YOUR website!
Let x=bags of .08 cement needed to make .11 cement.
6*.16=.96
x*.08=.08x
----------------
.11(6+x)=.08x+.96
.
.66+.11x=.08x+.96
.03x=.3
x=10 bags
.
Ed