The cost, in dollars, of filling your gas tank is directly proportional to the amount purchased. If 19 gallons of gas costs $26.60, how much would 22 gallons cost?
A) $30.80
B) $29.60
C) $31.60
D) $13.57

Question

Quizplus · Accepted Answer

The cost is directly proportional to the amount purchased, so you can set up a proportion: 19 gallons/$26.60 = 22 gallons/x. Solving for x gives you $30.80.

The Cost, in Dollars, of Filling Your Gas Tank Is