ACT Work Keys Level: 3

Problem

A coolant system has a capacity of 7½ quarts. If the ratio of antifreeze to water is 50:50, how much of each must be added after the system has been drained and cleaned?

Solution

50:50 = 1/2
1/2(7 1/2) = 1/2(15/2) = 15/4 = 3.75 qts of water (and 3.75 qts of antifreeze)