You feel your car was 15 gallons of gas at a cost of $45 using fractional notation. How do you write a proportion that shows how much 5 gallons of gas will cost use X to represent the unknown cost

Answer 1

$45 / 15 gallons = X / 5 gallons

This can be simplified to:

3 = X / 5

Therefore, X = $15.

So, 5 gallons of gas will cost $15.