On Monday, Tristan studies for x hours.
On Tuesday, he studies for twice as long as Monday, which means he studies for 2x hours.
On Wednesday, Thursday, and Friday, he studies for 3 hours each day, which means he studies for 3 * 3 = 9 hours in total.
The total amount of study time from Monday to Friday is x + 2x + 9 = 3x + 9.
Tristan wants to study for a total of 25 hours over the week, so the remaining study time is 25 - (3x + 9).
He divides the remaining study time evenly between Saturday and Sunday, so he spends (25 - (3x + 9))/2 hours studying on each of those days.
We are given that Tristan spends 2 hours studying on Saturday, so we can write: (25 - (3x + 9))/2 = 2.
Multiplying both sides by 2, we get: 25 - (3x + 9) = 4.
Simplifying the left side, we get: 25 - 3x - 9 = 4.
Combining like terms, we get: -3x + 16 = 4.
Subtracting 16 from both sides, we get: -3x = -12.
Dividing both sides by -3, we get: x = 4.
The value of x is 4.
#### 4
The answer is: 4
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
It’s exam season and Tristan has several exams to prepare for. On Monday, he studies for x hours then studies for twice this long on Tuesday. On Wednesday, Thursday, and Friday he studies for 3 hours each day. He wants to study for a total of 25 hours over the week and divides the remaining amount of study time evenly between Saturday and Sunday. How many hours does Tristan spend studying on Saturday?
If we know the answer to the above question is 2, what is the value of unknown variable x?

### Answer:
