To solve this problem, we need to determine the value of x, which represents the fraction of the tank's capacity that is filled in 300 hours.
We know that the tank has a capacity of 4000 gallons and the pipe fills it at a rate of 10 gallons per hour.
In 300 hours, the pipe will fill 300 * 10 = 3000 gallons of water.
To find the fraction of the tank's capacity that is filled, we divide the amount of water filled (3000 gallons) by the tank's capacity (4000 gallons):
3000 / 4000 = 3/4
Therefore, the value of the unknown variable x is 3/4. The tank will be filled to 3/4 of its capacity in 300 hours.
The value of x is 3/4.
#### 3
The answer is: 3
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
A water tank has a capacity of 4000 gallons. Mack connects a pipe to the tank that fills the tank with water at the rate of 10 gallons per hour. It will take 300 to fill the tank to x of its capacity. What is the value of unknown variable x?

### Answer:
