Exercise 8 Page 110

Recall that a ratio is a comparison of two quantities by division. For example, the ratio of a to b can be written in two different ways. a/b or a: bThe number a b is called the value of the ratio. It describes the multiplicative relationship between the quantities in a: b. We want to write the ratio of dolphins to animals from the following diagram.

Let's count the dolphins and the animals.

We have 5 dolphins and 9 animals. Then, the ratio of dolphins to animals is 5: 9 and its value is 5 9. This indicates that there are 5 dolphins for every 9 animals.