Question 21 - Mathematical Reasoning Practice Test for the GED Test

The Smith family is going to take a vacation to Florida. They live in Illinois, and have figured out that the trip is 1,150 miles from their house to the hotel in Florida. They get 28 miles per gallon of gas. If they start their trip with a full tank of gas and a full tank holds 20 gallons of gas, about how many times will the Smith family have to stop for gas on their way to Florida?