Interview Puzzles :: Discussion
Shown above are four men buried up to their necks in the ground.
can't move they can only look forward. Between A and B is a brick wall which is completely opaque (they absolutely can't see through it).
They are all aware that each of them is wearing a hat, and that two of them are wearing a black hat, and two of them are wearing a white hat.
They don't know what color THEY are wearing. However, each of them DOES
know where the other three are buried.
order to avoid being executed, one of them must call out to the
executioner the color of their hat. If they get it wrong, everyone will
be shot. They can't talk to each other and have only 10 minutes to
figure it out.
After 60 seconds, one of them calls out.
QUESTION: Which one of them calls out? How can he be certain he knows the color of his hat?
No Best Answer on this question yet!
Asked In : Sapient
17 Mar, 2018 8:59 AM
C calls out that he is wearing a black hat.
Heâ€™s 100% certain because D canâ€™t answer, and neither can A or B.
can see C and B, but canâ€™t determine his own hat color. B canâ€™t see
anyone and also canâ€™t determine his own hat color. A is in the same
situation as B, where he canâ€™t see anyone and canâ€™t determine his own
Since A, B, and D are silent,
that leaves C. C knows he is wearing a black hat because if D saw that
both B and C were wearing white hats, then he would have answered. But
since D is silent, C knows that he must be wearing a black hat as he can
see that B is wearing a white hat.