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?

Answer 1

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