Bill uses 5 squares of toilet paper each time he goes to the bathroom.
He goes to the bathroom three times a day.
So, he uses a total of 5 x 3 = 15 squares of toilet paper per day.
Each roll contains 300 squares of toilet paper.
He has 1000 rolls of toilet paper.
So, he has a total of 1000 x 300 = 300,000 squares of toilet paper.
His supply of toilet paper will last him 300,000 / 15 = 20,000 days.
#### 20000
The answer is: 20000
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
If Bill uses 5 squares of toilet paper each time he goes to the bathroom, and he goes to the bathroom three times a day, how many days will his supply of 1000 rolls of toilet paper, with each roll containing 300 squares, last him?

### Answer:
