I thought of a number. My number doubled is 20 greater than 200. Find my number.

Let's call the number you thought of "x."

We are told that "My number doubled is 20 greater than 200." This can be written as an equation: 2x = 200 + 20.
Simplifying this equation, we have 2x = 220.
To find the value of x, we need to isolate x. We can do this by dividing both sides of the equation by 2: (2x)/2 = 220/2.
This simplifies to x = 110.
Therefore, your number is 110.