A chemical company makes two brands of antifreeze. The first brand 60% is pure antifreeze, and the second brand is 85% pure antifreeze. In order to obtain gallons of a mixture that contains 130 pure antifreeze, how many gallons of each brand of antifreeze must be used?

How much money does ron have left each month after his fixed expenses? ron graduated from college five years ago. he recently bought a house, but shares it with a housemate who pays him $800 a month for rent and utilities. ron is putting a budget worksheet together so he will have a better idea of where his money is going and where he can save. enlarge