ILTS 206 Sub-Area 3 Practice Question #03

The gasoline tank of a car holds 15 gallons when full. If there are 7 gallons of gasoline in the tank, how many gallons of gasoline are needed to fill the tank?

Which of the following is most appropriate to use to correctly answer the question shown? 

The answer of 8 is found by subtracting 7 from 15.