A chemical company makes two brands of antifreeze. The first brand is 20% pure antifreeze, and the second brand is 45% pure antifreeze. In order to obtain 130 gallons of a mixture that contains 30% pure antifreeze, how many gallons of each brand of antifreeze must be used
130 gallons of a mixture that contains 30% pure antifreeze, how many gallons of each brand of antifreeze must be use