Question

Anja buys gas for her car at $3 per gallon. Write an equation using two variables to show the relationship between the number of gallons of gas, g, and the total amount she spends, s.
A. s = g/3
B. g = 3s
C. s = 3 + g
D. s = 3g

Answer 1

To express the relationship between the number of gallons of gas (g) Anja buys and the total amount of money (s) she spends, we know that the cost per gallon is $3. Therefore, the total cost can be calculated by multiplying the number of gallons by the price per gallon.

The correct equation is:

\[ s = 3g \]

So the answer is **D. s = 3g**.