A comparison between the sizes of two quantities. A ratio shows how many times one quantity can fit into the other.
Example 1: Janice has a variety of shirts in her closet. For every 5 red shirts she has, she has 4 blue shirts. Determine the ratio of red to blue shirts in Janice's closet.
Because Janice has 5 shirts for every 4 blue shirts, the ratio can be written as follows