Here is a little math oddity for you to solve.

3 guys go fishing and get a motel room for the night for $30. They each pay $10...10 x 3 =$30.
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A hour later the desk guy realizes he over charged them $5, so he asks the bell boy to take the $5 up to the guys. When he gets to the room he wonders how he will divide $5 between 3 guys, so he decides to just give them each $1 back and he keeps $2.
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So...if they each originally paid $10 and each got $1 back...(3 x $9 = $27) and the bell boy kept $2....$27 + $2 = $29, where did the other $1 go?