Students in the 7th and 8th grade at Imawinner Middle School are going on a field trip to the aquarium. If a student actively participates in the engagement activities at the aquarium, they are entered into a raffle to win a free lunch from their favorite restaurant. The table below shows the number of students in each grade and homeroom who engaged in the activities.
| Homeroom | 7th Grade | 8th Grade |
|----------|-----------|-----------|
| A | 15 | 12 |
| B | 10 | 14 |
| C | 13 | 11 |
| D | 12 | 13 |