Answer:
The elevator started on the first floor and went up 18 floors. After that, it came down 11 floors and went back up 16. To determine the final floor where the elevator stopped, we can follow these steps:
1. Start at the first floor.
2. Go up 18 floors, which brings us to the 19th floor.
3. From the 19th floor, go down 11 floors. This takes us to the 8th floor.
4. Finally, go up 16 floors from the 8th floor. This brings us to the 24th floor.
Therefore, the elevator finally stopped at the 24th floor.
Explanation: