soybean meal is 16% protien,cornmeal is 8% protien.How many pounds of each should be mixed together in order to get a 320 lb. mixture that is 12% protien?

Question

anonymous · Answer

put x = amount of soybean mixture, it has 16 % protein so it contributes 0.16x protein.  then since the total is 320 the amount of cornmeal must be 320 - x which contributes 0.08(320-x) protein.  the total amount is 12% of 320 =0.12  times 320 so set 
$$0.16x+0.08(320-x)=0.12\times 320$$ and solve vor x

anonymous · Answer

so how many pounds of man pounds of cornmea go into this mixture to make 12% mixutre exactly?