a certain car uses 12 gallons of gasoline in traveling 300 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 ?
"300 / 10 = 30 . the difference is 30 - 25 = 5 . answer c"
subtract(divide(300, 10), divide(300, 12))