Exercise 15 Page 188

We want to complete a table. We can use the portion where both values are known to find the missing values.

We know that we burn 20 calories in 1/6 miles. Let's write this as a ratio. 20calories/16miles or 20/16We will use this rate to find the missing values.

First Value

We can find an equivalent ratio with a denominator of 23 to find how many calories we burn in 23 miles.

We burn 80 calories in 23 miles.

Second Value

Now, we can find an equivalent ratio with a numerator of 10 to find how many miles we travel to burn 10 calories.

We burn 10 calories in 112 miles.

Third Value

Now, we can find an equivalent ratio with a numerator of 90 to find how many miles we travel to burn 90 calories.

We burn 90 calories in 34 miles.

The equivalent ratios are 20: 16, 80: 23, 10: 112, and 90: 34.