Shown above are 4
men buried up to their necks in the ground. They can not move so can
only look forward. Between A and B is a wall which can not be seen
through. They know that between them are 4 hats, 2 black and 2 white,
but they do not know which color they are wearing.
In order to avoid
being shot, one of them must call out to the executioner the color of
their hat. If they get it wrong, everyone will be shot. They are not
allowed to talk to each other and have 10 minutes to fathom it out.
After 1 minute:
Q. Which
one of them calls out?
Q. Why
is he 100% certain of the color of his hat?
This is not a trick
question. There are no outside influences nor other ways of
communicating. They cannot move and are buried in a straight line. So
A & B can only see their respective sides of the brick wall, C can see
B, and D can see B & C.
For the answer go
to
Puzzle