We know that Gumball drank nine liters of water on Monday, Thursday, and Saturday, and eight liters of water on Tuesday, Friday, and Sunday.
So the total amount of water he drank on those days is 9 + 9 + 9 + 8 + 8 + 8 = 51 liters.
We are given that the total amount of water he drank for the week is x liters, so we can write: 51 + W = x, where W represents the amount of water he drank on Wednesday.
We are also given that the amount of water he drank on Wednesday is 9 liters, so we can write: 51 + 9 = x.
Simplifying the left side, we get: 60 = x.
The value of x is 60.
#### 60
The answer is: 60
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
Gumball was counting his water intake for the previous week. He checked his list and saw that he had drank x liters of water for the week. He drank nine liters of water on Monday, Thursday and Saturday and 8 liters of water on Tuesday, Friday and Sunday. Unfortunately, no data was input on Wednesday. How many liters of water did he drink on Wednesday?
If we know the answer to the above question is 9, what is the value of unknown variable x?

### Answer:
