Source : http://neworder.box.sk/subject.php?subject=Out%20of%20the%20box
Cygnum writes: This one is guaranteed to drive you crazy till you solve it:
Three friends come to a hotel. They pay the receptionist 300$ for a room - 100$ each. Later that day, the receptionist regrets charging them so much so he gives the bellboy 50$ to give back to the three friends. The bellboy decides to steal 20 of those 50 dollars and he only gives back 10$ to each of the friends.
In the end, it turns out that the three friends payed 90$ each, plus there are 20 dollars in the bellboy's pocket - a total of 290$. Where are the missing ten dollars?
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