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A chemical company makes two brands of anti freeze. The first brand is 55% pure anti freeze, and the second brand is 80% pure anti

A chemical company makes two brands of anti freeze. The first brand is 55% pure anti freeze, and the second brand is 80% pure anti freeze. In order to make 170 gallons of a mixture that contains 75% pure anti freeze, how many gallons of each brand of antifreeze must be used?

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