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A chemical company makes two brands of antifreeze. The first brand is 55% pure antifreeze, and the second brand is 95% pure antifreeze. In order

A chemical company makes two brands of antifreeze. The first brand is 55% pure antifreeze, and the second brand is 95% pure antifreeze. In order to obtain 180 gallons of a mixture that contains 85% pure antifreeze, how many gallons of each brand of antifreeze must be used?

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