Answer
The car will use 30 gallons of gas on a 615-mile trip.
Work Step by Step
Let x represent the amount of gas the car will use on a 615-mile trip.
Now, let’s set up a proportion in which one ratio compares the amount of fuel used and the other ratio compares the corresponding distances traveled.
$\frac{18}{x}$ = $\frac{369}{615}$
To solve this equation, we equate the cross products.
18 $\times$ 615 = x $\times$ 369
11070 = 369x
Divide both sides by 369.
30 = x
The car will use 30 gallons of gas on a 615-mile trip.
