The Langs family drove 225 miles to a beach. Most of their travel was on interstate highways. • The Langs drove 65 miles per hour on the last 45 miles of their trip. • On average, the Langs traveled 20 miles on one gallon of gas. • The gas tank on the Langs' car holds 15 gallons of gas.

• The Langs had a full tank when their trip began. How many times did they stop to refill the tank before they reach the beach