A survey of a group of students was conducted. The students were asked if they were taking a Math class, a Biology class, or a French class this term. How many students were taking a Biology class?

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.

The answer would be a