I found this in an email that I received a few months ago, forgive me if it has already been psoted here. And no, I don't know why three men would share the same room. -> Three salesmen decided to share a $30 hotel room for one night and split the cost evenly. After they checked in, the hotel manager noticed that they should have been charged only $25 for the room. So, he gave the porter five one-dollar bills and said to return the money to the three men. As the porter was walking to the salesmen's room, he wondered how he was going to split the five dollars evenly between the three salesmen. So, he put two dollars in his pocket and gave each of the three salesmen one dollar. Now, if each of the salesmen paid $10 for their share of the room and were given one dollar back, then they each would have paid $9 for the room. Nine times three is twenty-seven, plus the two dollars the porter put in his own pocket is twenty-nine (9 x 3 = 27. 27 + 2 = $29) Where is the other dollar?