To find the number of miles Aaden traveled in the taxi, we can set up the equation based on the information provided.
Let \( x \) be the number of miles in the taxi ride.
The total fare can be calculated as follows:
- The pick-up fee is $3.10.
- The cost per mile is $2.75 per mile, so for \( x \) miles, the cost would be \( 2.75x \).
The total fare equation can be expressed as:
\[ 3.10 + 2.75x = 27.85 \]
Now, we will solve for \( x \).
- Subtract the pick-up fee from both sides:
\[ 2.75x = 27.85 - 3.10 \]
\[ 2.75x = 24.75 \]
- Now, divide both sides by 2.75 to isolate \( x \):
\[ x = \frac{24.75}{2.75} \]
- Performing the division:
\[ x = 9 \]
Therefore, the number of miles in the taxi ride is \( \boxed{9} \).