# A car travels 90 miles on 5 gallons of gas. How do you give the ratio of miles to gallons as a rate in miles per gallon?

Jun 3, 2018

Set up the ratio as a fraction and divide by the gallons.

#### Explanation:

$\frac{90}{5} = \frac{18}{1}$

The ratio is 18 miles/gallon

Jun 3, 2018

$18 \setminus \text{miles/gallon}$

#### Explanation:

Simply divide the number of miles driven by the number of gallons used.

$\left(90 \setminus \text{miles")/(5 \ "gallons}\right)$

$= 18 \setminus \text{miles/gallon}$