Solution for: Trouble in Paradox
The reason this paradox seems to work is that it makes you forget about
one of the 13 teachers.
When the manager puts the twelfth teacher in room #11 there is still one
teacher waiting for a room.
However, the phrasing makes you think that the thirteenth teacher is waiting
in the first room, when it
is actually the second teacher. The paradox is illustrated in the diagram
below.
