How do i convert a value to another?

Example: Object Holder Y = 55 Object Y = 10

I want to like, if its on the center of the object holder(Y = 27.5), it will be 50 the value and if its on the top, the value is 100, in the bottom is 0.

I'm not sure I fully understand

x/maxX gives a range from 0-1 if you want you can multiply that by 100.

thanks... but when the object gets to the center the value goes to 0 instead of half of the value

nvmd i just figured out