A chemical company makes two brands of antifreeze. The first brand is 30% pure antifreeze, and the second brand is 55% pure antifreeze. In order to obtain 150 gallons of a mixture that contains 45

A chemical company makes two brands of antifreeze. The first brand is

30%

pure antifreeze, and the second brand is

55%

pure antifreeze. In order to obtain

150

gallons of a mixture that contains

45%

pure antifreeze, how many gallons of each brand of antifreeze must be used?