SOLUTION: How many pints of a 5% antifreeze solution and how many pints of a 20% antifreeze solution must be mixed to obtain 12 pints of a 15% solution?

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Question 354443: How many pints of a 5% antifreeze solution and how many pints of a 20% antifreeze solution must be mixed to obtain 12 pints of a 15% solution?
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
(x)(5%) + (12 - x)(20%) = (12)(15%)