Okay, I tried this, and it worked, "but how?" I asked myself. I thought I would turn to my intellectual Seinfeld friends. :) Check it out...
PICK A NUMBER from 10 to 100 (but don't tell anybody what it is!)
then DOUBLE IT.
Now ADD 12.
then DIVIDE BY 2.
Finally... SUBTRACT YOUR ORIGINAL NUMBER. (do you still remember it?)
And here's the weird part: