You fill your car with 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.(1 point)

Answer 1

The proportion would be:

15 gallons / $45 = 5 gallons / x

Using cross multiplication, we can solve for x:

15x = 225

x = 225/15

x = 15

Therefore, 5 gallons of gas would cost $15.