Soybean meal is 12% protien; cornmeal is 6% protein. How many pounds of each should be mixed together in order to get 240 lb mixture that is 10% protein 

How many pounds of the cornmeal should be in the mixture?____lb 

How many pounds of the soybean meal should be in the mixture?____lb

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Equation:

protein + protein = protein

0.12x + 0.06*(240-x) = 0.10*240

Multiply thru by 100 to get:

12x + 6*240 - 6x = 10*240

6x = 4*240

x = 160 lb (amount of cornmeal needed in the mixture)

240-x = 80 lb (amount of soybean meal needed in the mixture)