To determine the number of miles \( x \) in the taxi ride, we can set up the equation based on the given information.
The total fare consists of a pick-up fee and a charge per mile. The pick-up fee is $1.60, and the charge is $1.75 per mile. Therefore, the total fare can be expressed with the equation:
\[ \text{Total Fare} = \text{Pick-up Fee} + (\text{Cost per Mile} \times \text{Number of Miles}) \]
Substituting the known values into the equation:
\[ 20.85 = 1.60 + 1.75x \]
Now, we will solve for \( x \):
- Subtract the pick-up fee from both sides:
\[ 20.85 - 1.60 = 1.75x \]
\[ 19.25 = 1.75x \]
- Divide both sides by 1.75 to isolate \( x \):
\[ x = \frac{19.25}{1.75} \]
- Perform the division:
\[ x = 11 \]
Thus, the number of miles in the taxi ride is \( \boxed{11} \).