Homework Help: algebra

Posted by Chrysanne on Thursday, January 21, 2010 at 11:54am.

soybean meal is 18% protein; cornmeal is 9% protein. How many pounds of each should be mixed together in order to get 360-lb mixture the is 15% protein.

.18s+.09c
---------
360 =.15

18s+9c=5400
s+c=360

now I am lost. appreciate any help

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