Answer:
52 is the correct answer
They would be any fraction between 0 and 1.
Example- 1/3 * 1/2 = 1/6 (They all are less than one)
1/5 * 1/8 = 1/40
The answer is X - 10 = 0
If you click the image it will show you how to solve the equation. I hope this helps you :)