Each Ferris wheel in paradise park has w seats. Each seat in a Ferris wheel can hold x people. How many people can ride y Ferris wheels at the same time?
First, we need to find out how many seats are in y Ferris wheels. We know that each Ferris wheel has w seats, so y Ferris wheels must have wy seats. 

Now, we need to find out how many people can ride in wy seats. We know that each seat can hold x people, so wy seats can hold wyx people. 

Therefore, the answer (symbolic expression) is: 

wyx