Homework Help: math

Posted by karen on Saturday, September 12, 2009 at 12:13am.

soybean meal is 18% protein, and cornmeal is 9% protein. How many pounds of each should be mixed together in order to get 360lb mixture that is 17% protein. how many lbs should be cornmeal and how many lbs should be soybean be?

math - drwls, Saturday, September 12, 2009 at 1:30am
Let S be the soybean amount and C be the cornmeal amount, in pounds.

S + C = 360 (the total amount)
0.18 S + 0.09 C = 0.17 * 360 = 61.2
(total protein amount)
Solve the two equations in two unknowns.
I assume you know how to do that.

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