Question

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)
Responses

1545=x5

Start Fraction 15 over 45 End Fraction equals Start Fraction x over 5 End Fraction

15x=455

Start Fraction 15 over x End Fraction equals Start Fraction 45 over 5 End Fraction

15:45::x:5

ratio of 15 to 45 colon colon ratio of x to 5

1545=5x

Answer 1

Set up equal unit rates: 45/15 = x/5.
Solve: 45·5 = 15x → 225 = 15x → x = 15.
So 5 gallons costs $15.