Three guys go into a hotel. They want a room for the night. The man at the front desk says:

- For the three of you , one room for one night is $30.

They split the bill so each of them pays 10$.

Suddenly the receptionist remembered that he made a mistake and its not 30$ but its only 25$.
Since he couldnt divide the 5$ among the three people he decided to give one dollar back to each of them (so each of them pays 9$ for the room) and pocket the leftover 2$.

If the three guys paid a total of 27$ for the room and the receptionist kept the leftover $2..

Where the extra 1$ gone?