Soybean meal is 18% protein; cornmeal is 9% protein. How many pounds of each should be mixed together in order to get 360-lb miixture that is 11% protein? How do I even start this?

Question

Soybean meal is 18% protein; cornmeal is 9% protein. How many pounds of each should be mixed together in order to get 360-lb miixture that is 11% protein?                                                 How do I even start this?

anonymous · Answer

soybean + Cornmeal = 360 lb
.18soybean + .09Cornmeal = .11(360)

anonymous · Answer

and then 
soybean = 360 - Cornmeal , plug this into the bottom equation

callisto · Answer

let x pounds be the pounds of Soybean meal , 
then, pounds of cornmeal = 360- x
18% (x) + (360-x) 9% = 11% (360)
0.18x-0.09x + 32.4 = 39.6
x=80
therefore pounds of Soybean meal required is 80 pounds and pounds of cornmeal required is (360-80)pounds, that is 280 pounds

anonymous · Answer

.18(360-Cornmeal) + .09Cornmeal = .11(360)

anonymous · Answer

Nevermind Callisto is Faster =)

callisto · Answer

i thought i was the slower one XD