After the first day, Triana has traveled 24 miles out of her total goal of 120 miles. To find out how many miles she has left to complete her bike ride, you can subtract the distance she has already traveled from the total distance:
\[ 120 \text{ miles} - 24 \text{ miles} = 96 \text{ miles} \]
So, after the first day, Triana has 96 miles left to travel over the remaining three days of her bike ride.
If you have more specific questions about her ride, such as her daily distances or average speed, feel free to ask!