Question 573810
Let x=amount of soybean meal needed
Then 280-x=amount of cornmeal needed

Now we know that the amount of pure protein that exists before the mixture takes place has to equal the amount of pure protein that exists after the mixture takes place, sooooo:
0.14x+0.07(280-x)=0.12*280
0.14x+19.6-0.07x=33.6
0.07x=33.6-19.6
0.07x=14
x=200 lb----amount of soybean meal needed
280-x=280-200=80 lb ----amount of cornmeal needed
CK
200*0.14+0.07*80=0.12*280
28+5.6=33.6
33.6=33.6


Hope this helps----ptaylor