saras car uses an average amount of one gallon of gasoline for every 28 miles she drives. If the gallons costs $1.69 per gallon, how much will the gasoline for a 420-mile trip cost?
You know this because 420/28 finds the number of gallons of gas that you will need which is 15. 1 gallon of gas is $1.69 therefore 15 gallons of gas would be 15 * $1.69 = $25.35
