Algebra
posted by Donna .
I have a problem that I need help with can someone show me the steps
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Soybean meal is 16% protein and corn meal is 9% protein. How many pounds of each shoul be mixed to get a 350lb mixture that is 12% protein?

Why do i never get any help

let the amount of 16% mix to be added be x lb
let the amount of 9% mix to be added be 350x lb
.16x + .09(350x) = .12(350)
multiply by 100
16x + 9(350x) = 12(350)
16x + 3150  9x = 4200
7x = 1050
x = 150
then 350x = 200
They should use 150 lb of the 16% mix and
200 lb of the 9% mix 
Thank you