SOLUTION: soy bean meal is 14% protein; corn meal is 7% of protein. How many pounds of each should be mixed together in order to make 280 pound mixture that is 13% protein?

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Question 951455: soy bean meal is 14% protein; corn meal is 7% of protein. How many pounds of each should be mixed together in order to make 280 pound mixture that is 13% protein?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Let u be how much of the corn meal, in pounds.
280-u is how much of the soy bean meal.

highlight_green%28%287u%2B14%28280-u%29%29%2F280=13%29.
Solve for the one variable, u.

7u%2B14%2A280-14u=13%2A280
-7u%2B14%2A280=13%2A280
7u=14%2A280-13%2A280
7u=280
highlight%28u=40%29