Question 523845


Let

He mixes 50% corn = x pound
He mixes 90% corn = 30-x pound
Mixture of 80% corn = 30 pound

50% corn * x pound  + 90% corn * (30-x)=80% * 30
0.5*x+0.9*(30-x)=0.8 * 30
0.5x+27-0.9x=24
0.5x-0.9x=24-27
-0.4x=-3
-0.4x/-0.4=-3/-0.4
x=7.5 

He should mix 7.5 pounds of 50% corn and (30-x=30-7.5=22.5) 22.5 pounds to get a mixture of 30 pound of 80% corn