soybean meal is 18% protein; cornmeal is 9% protein. How many pounds of each should be mixed together in order to get 360-lb mixture tha is 13% protein?

How many LBS of the cornmeal should be in the mixture and how many lbs of the soybean meal should be in the mixture?

1 answer

let the amount of cornmeal be x lbs
then the amount of soybeans is 360-x lbs

.09x + .18(360-x) = .13(360)
multiply by 100
9x + 18(360-x) = 13(360)

I am sure you can finish it from there.