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Answer:
1. The floor where the elevator is currently on.
2. The elevator was on the 5th floor, then it moved down three floors, and then moved up six floors.
3. Subtraction and Addition.
4. (5 - 3) + 6 = n
5. (5 - 3) + 6 = 8
The elevator is currently on the 8th floor.
Hope it helps.