Posted by Kimmie on Wednesday, September 22, 2010 at 10:39am.
A batch of concrete is made by mixing 1 part cement, 2.5 parts sand, and 3.5 parts gravel. How many pounds of sand and gravel are needed to make 300 pounds of cement?

Algebra  PsyDAG, Wednesday, September 22, 2010 at 1:02pm
2.5/7 = x/300 for sand
3.5/7 = x/300 for gravel
In each case, solve for x.

Algebra  Kimmie, Wednesday, September 22, 2010 at 2:10pm
I figured it out, and actually you multiply the 2.5 by 300 and then the 3.5 by 300 to get the amount of sand and gravel!!

Algebra  Anonymous, Thursday, September 22, 2016 at 5:48pm
2.5x300=750. 3.5x300=1,050
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