SOLUTION: how much 50% antifreeze solution and 30% antifreeze solution should be combined to give 85 gallons of 38% antifreeze solution

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Question 972904: how much 50% antifreeze solution and 30% antifreeze solution should be combined to give 85 gallons of 38% antifreeze solution
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
http://www.algebra.com/my/Mixtures%3A-All-in-Symbols.lesson?content_action=show_dev

You can do the problem through ONE variable and solving may be simpler.

Let x be how much of the 30% antifreeze to use.
85-x is the amount of the 50% antifreeze to use.

%2830x%2B%2885-x%2950%29%2F85=38