Algebra
posted by Bob .
Soybean meal is 16% protein and corn is 9% protein. How many pounds of each should be mixed to get a 350 lb mixture that is 12% protein?

Algebra 
Damon
s pounds of soy
c pounds of corn
s + c = 350
or c = 350  s
.16 s + .09 c = .12 * 350 = 42
so
.16 s + .09(350  s) = 42
etc
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