EXPLANATION
Let's see the facts:
Blue car:
40 miles ---->
Red car:
20/4 miles ----> 5 gallons
Unit rate formula:
[tex]unit_{\text{ }}\text{rate = }\frac{dis\tan ce\text{ in miles}}{\text{gallons}}[/tex]For example, suppose that the blue car travels 37 1/2 miles on 1 3/4 gallons of gasoline, the unit rate will be:
[tex]unit_{\text{ }}\text{rate = }\frac{37\frac{1}{2}}{\text{1}\frac{1}{4}}=\frac{150}{70}\text{miles per gallon}[/tex]
