Hehehehehe--that's my favorite Evil!! And, since I know it, I'll let it ride for the others...
Okay, here's another one for ya.
You and I are shooting models. You look at me and say "Hey, why don't you give me one of your models, and then I can have twice as many as you do." I say, "No, why don't you give me one of YOUR models, and we can be even."
How many models does each of us have? )
It only works with 2 numbers...and as a hint, the numbers are lower than 10.
And, since I know it, I'll let it ride for the others... 
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