Bounding over to the mailbox, Jack eagerly emptied its contents. As he strolled back to the house, he sifted through the pile, finding bills and advertisements. But one envelope stood out—a bright blue one adorned with ocean waves, and, to his surprise, it had his name on it!

Meeting him at the door, Jack's mom took the remaining mail, and Jack excitedly called his friends over to open the special blue envelope. “Come see what I got in the mail!”  The return address read "Underwater Adventures," triggering a memory in Jack's mind. He remembered participating in a reading contest at school. Any student who read 5 books or more was entered into a grand prize drawing. Jack had read an impressive 13 books. Could this mean he had won?