Levi started collecting lunch boxes when he was 5 years old. He had 18 superhero lunch
boxes, 24 outer space lunch boxes, and 21 rock band lunch boxes.
)) Then Levi's cousin started her own lunch box collection. Levi wanted to help her get
started, so he gave his cousin 25 lunch boxes from his collection. How many lunch boxes
does Levi have left in his collection?