Answer: 4.8 Gallons of Gas
Explanation:
Well in the graph we can see that for every 1 gallon of gas used, Dustin has drove 25 miles which he can also use to reference how many gallons of gas he will need for a trip of 120 miles.
So just multiply 25 by 4.8 and you would get 120 miles drove.
(4.8 being the amount of gallons of gas)