There were 18 stamps in Parker's scrapbook.
Addie put x fourth of her 72 stamps in Parker's scrapbook, which means she put (x/4)*72 stamps.
The total number of stamps in Parker's scrapbook now is the sum of the original number of stamps and the number of stamps Addie added: 18 + (x/4)*72.
We are given that the total number of stamps in Parker's scrapbook is 36, so we can write: 18 + (x/4)*72 = 36.
Simplifying the left side, we get: 18 + 18x = 36.
Subtracting 18 from both sides, we get: 18x = 18.
Dividing both sides by 18, we get: x = 1.
The value of x is 1.
#### 1
The answer is: 1
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
There were 18 stamps in Parker’s scrapbook. If Addie put x fourth of her 72 stamps in Parker’s scrapbook, how many stamps does he have now?
If we know the answer to the above question is 36, what is the value of unknown variable x?

### Answer:
