In 1 hour, there are 60 minutes.
The show can have 5 actors at a time, and each actor is in the show for x minutes.
So in 1 hour, the number of actors that can be in the show is (60/x) * 5.
We are given that the number of actors in the show in 1 hour is 20, so we can write: (60/x) * 5 = 20.
Dividing both sides by 5, we get: (60/x) = 4.
Multiplying both sides by x, we get: 60 = 4x.
Dividing both sides by 4, we get: x = 15.
The value of x is 15.
#### 15
The answer is: 15
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
In a show, there can be 5 actors at a time. Every actor is in the show for about x minutes, and then another 5 actors come in. How many actors can there be on the show in 1 hour?
If we know the answer to the above question is 20, what is the value of unknown variable x?

### Answer:
