Chef Mario used of a half-gallon of milk for a cake. What fraction of a gallon of milk did he use? A.5/16

B.6/10

C.2/3

D.3/4

When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. if you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.