a certain car uses 12 gallons of gasoline in traveling 360 miles . in order for the car to travel the same distance using 10 gallons of gasoline , by how many miles per gallon must the car ’ s gas mileage be increased ?
"360 / 10 = 36 . the difference is 36 - 30 = 6 . answer c"
subtract(divide(360, 10), divide(360, 12))