Question 395552
Soybean meal is 12% protein; cornmeal is 6% protein. How many pounds of each should be mixed together in order to get 240-lb mixture that is 9% protein?
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Soybean------ 12% protein; ----------x
cornmeal ------6% protein. ----------(240-x)
mix ---------- 9% protein-------240-lb
..
12x+6(240-x)=240*9
12x+1440-6x=2160
6x=2160-1440
6x=720
/6
x=120  
soyabean 120 lbs.
Cornmeal 240-120 =120 lb