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!!

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