Need equation for Lee drove 420 miles and used 15 gallons of gasoline. How many miles did Lee's car travel per gallon of gasoline

the answer is 28 because 420 ÷ 15 = 28

If it's an algebraic exspression, m miles divided by g gallons equals miles per gallon. For the actual equation, 420/15= 28 or 28 mi. per gallon. :)