Final answer:
Walter can enjoy 20 rides at the festival.
Step-by-step explanation:
To determine how many rides Walter can enjoy at the festival, we need to subtract the admission fee from the total amount he has. To find the number of rides, we divide the remaining amount by the cost per ride.
Step 1: Subtract the admission fee from $25: $25 - $10 = $15
Step 2: Divide the remaining amount by the cost per ride: $15 ÷ $0.75 = 20 rides
Learn more about Calculating the number of rides at a festival