Answer:
1.2 gallons
Explanation:
I got this answer by dividing 5.03 by the total amount of one gallon, which is 4.19.
Since, he only payed a little over the cost for one gallon, then he got over a liitle over one gallon.
When you divide 5.03 by 4.19, you get 1.200477327. The only thing you need to do, is round. If you round, you get 1.2.
Hope this helped you a lot. :) <3