soybean meal is 16% protein: conrmeal is 8% protein. How many pounds of each should be mixed together in order to get 320-lb mixture that is 15% protein

pound of corn meal=

pound of soybean meal=

since 16% is closer to 15% we know we will need more of the soybean meal

call soybean mixture x, and cornmeal mixture 320-x

% * lbs mixture A + % * lbs mixture B = % * lbs mixture C

16% * x + 8% * (320-x) = 15% * 320

0.16x + 0.08*320 - 0.08x = 0.15*320

0.08x + 25.6 = 48

0.08x = 22.4

x = 280 lbs of soybean meal

320-x = 40 lbs of cornmeal