Exercise 7 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 sharks to dolphins from the following diagram.

Let's count the sharks and the dolphins.

We have 4 sharks and 5 dolphins. Then, the ratio of sharks to dolphins is 4: 5 and its value is 4 5. This indicates that there are 4 sharks for every 5 dolphins.