You are filling up your car with gas. Your tank can hold 19 gallons. Your car started with x gallons in it. You paid $20 in gas. What was the cost of gas per gallon?
Choose the correct answer.
A) 19/20  B) x/20  C) (19-x)/20  D) x-19)/20  E) 19+20/x
Amount of gas you added to your car: 19-x   Price per gallon: (19-x)/20   Answer: (19-x)/20
<result>C</result>
You are filling up your car with gas. Your tank can hold 19 gallons. Your car started with x gallons in it. You paid $20 in gas. What was the cost of gas per gallon?