Lazlo

When you buy a 27mm lens from Fuji it is the focal length of 27mm, the focal length of a lens does not change based on the camera body or sensor it is placed in front of.
 
The focal length written on the outside of the lens is actually a measurement of the distance between the point of convergence inside the lens and the sensor or film inside your camera. Here is a diagram that illustrates this point.
 

 
So when Fuji or any other manufacturer labels a lens as 27mm they are telling you what that measurement is, that's all.

No offense, but you just need some knowledge about focal length and physics
 
A lens never knows the sensor behind it. A 35mm will always be a 35mm, regardless if there's a Canikon, Hasselblad oder Fuji behind it. Or even a smartphone. What will definitely change is the angle of view. It's much smaller on a small sensor so it seems as if the focal length would be a greater one.
 
So what you really want is the same angle of view on every camera. But no one ever uses this attribute - all we talk about is the focal length. This is why everyone is confused when it comes to the crop factor.