To find out how many floors Ally traveled in the elevator, we need to calculate the total number of floors from the underground parking garage to the 12th floor of the hotel.
- The parking garage is 4 floors below ground level. This means there are 4 floors to get from the parking garage to ground level.
- Then, Ally needs to go from ground level to the 12th floor, which is 12 floors up.
Now we can add these two amounts together:
\[ 4 \text{ floors (up to ground level)} + 12 \text{ floors (up to the 12th floor)} = 16 \text{ floors} \]
Therefore, Ally traveled a total of 16 floors in the elevator.