Question 1201152
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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 that is 15% protein?
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x pounds of the 18% protein and (360-x) pounds of the 9% protein.


The protein mass equation is

    0.18x + 0.09*(360-x) = 0.15*360.


Simplify and find x

    0.18x + 0.09*360 - 0.09x = 0.15*360

    0.18x - 0.09x            = 0.15*360 - 0.09*360

        0.09x                =       21.6

            x                =       21.6/0.09 = 240.


<U>ANSWER</U>.  Mix 240 pounds of the soybean and 360-240 = 120 pounds of the cornmeal.
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Solved.