Time for a new puzzler. 

Here we go.

Three guys check into a motel in the middle of nowhere. They are running from the law and they have to lay low for a night.

They are really strapped for cash so they decide to share one room. The approach the front desk clerk and he tells them that one room will be $30. This is the cheapest motel ever. 

So, they each give the clerk $10 and then they go to the room. 

After they leave, the clerk realizes that he overcharged them. They were having a special on rooms, and the price was supposed to be $25, not $30. So, he gives the bellboy $5 and asks him to return this to the three guys, since he overcharged them. 

So the bellboy takes the $5, and as he is heading to the room, he thinks to himself, "Well, there are three guys, and $5. They won't be able to split this evenly, so I'm going to keep $2, and give them $3." So that's what he does. 

He says to them, "Here's $3. You were overcharged for the room." And they say, "Thank you very much." He leaves having pocketed $2.

So here is the question. 

They each spent $10 to start off with. Then they each get back $1. So they each spent $9 on the room. And 9 times 3 is 27. Plus the $2 that the bellboy stole. That all equals $29. 

So, what happened to the other dollar? Since they originally spent $30?

Good luck.