### Home > CCA > Chapter A > Lesson A.1.6 > ProblemA-64

A-64.

One of Teddy’s jobs at home is to pump gas for his family’s sedan and truck. When he fills the truck up with $12$ gallons of gas, he notices that it costs him $\39.48$.

1. How much does one gallon of gas cost? Explain how you found your answer.

One way to solve this problem is to set up a proportion.
Try using the proportion provided below.

$\frac{39.48}{12\text{ gals}}=\frac{\textit{n}}{1\text{ gal}}$

Multiply both sides by $12$ gallons and then solve.

$39.48 = 12n$

$3.29 = n$

2. How much will it cost him to fill up the sedan if it needs $15$ gallons of gas? Show your work.

Multiply the price per gallon by the number of gallons.

3. When Teddy filled up the tank on his moped, it cost $13.16$. How much gas did his moped need? Explain how you know.

Use a proportion to show the known price ($13.16$) over the unknown number of gallons and follow the strategy shown in part (a) to solve.