This might have been better put into the monthly joke thread, however,it's a math question-- so, have fun, and post your theories:


Three friends check into a hotel for the night and the clerk tells
>them the bill is $30, payable in advance. So, they each pay the
>clerk $10 and go to their room. A few minutes later, the clerk
>realizes he has made an error and overcharged the three by $5. He
>asks the bellhop to return $5 to the three friends who had just
>checked in. The bellhop sees this as an opportunity to make $2 as he
>reasons that the three friends would have a tough time dividing $5
>evenly among them; so he decides to tell them that the clerk made a
>mistake of only $3, giving a dollar back to each of the friends. He
>pockets the leftover $2 and goes home for the day! Now, each of the
>three friends gets a dollar back, thus they each paid $9 for the
>room which is a total of $27 for the night. We know the bellhop
>pocketed $2 and adding that to the $27, you get $29, not $30 which
>was originally spent. Where did the other dollar go????
>