4 hats Riddle (desc). 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 brick wall
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4 hats Riddle (desc)

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 brick wall which can not be seen through. They know that between them are 4 hats, 2 are black and 2 are 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
-Answer in comments

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Views: 16627
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Submitted: 07/07/2014
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User avatar #1 - entername (07/07/2014) [+] (30 replies)
stickied by entername
Man "C" knows his hat is black, "C" knows "B" has a white hat. If man "C" had a white hat then "D" would have known the answer right away... so since man "D" didn't answer he knows the color of his hat is black
User avatar #96 - entername (07/08/2014) [-]
stickied by entername

here is another brain teaser you guys can try
0
#95 - entername Comment deleted by entername [-]
stickied by entername
User avatar #2 - Mnementhdragon (07/07/2014) [+] (4 replies)
C knows that he has a black hat on.

He knows this because if he was wearing the same color hat as the person in front of him then the guy behind him would have been able to call out his own hat color. Since guy D didn't call out, then guy C knows that he must not be wearing the same color had as guy B.
User avatar #36 - wliia (07/08/2014) [+] (9 replies)
How about another riddle:

A plane is flying over the Canadian-American border. The plane crashes, and every single person on board dies, yet when the paramedics arrive they find survivors from the crash. How did this happen?
User avatar #38 to #36 - kerfufflemachtwo ONLINE (07/08/2014) [-]
There were married people.
#20 - helpmedudes (07/07/2014) [+] (1 reply)
I was really suspicious because I thought this would be one of those things that you spend time thinking about and then when you look at the answer it says something like "lol you just lost five minutes of your life!"  Good job, op.  This was interesting.
I was really suspicious because I thought this would be one of those things that you spend time thinking about and then when you look at the answer it says something like "lol you just lost five minutes of your life!" Good job, op. This was interesting.
#37 - chuffberry (07/08/2014) [-]
they all shake their heads violently back and forth until the hats fall off in front of them. they all call out their hat colors and ask to go home. the executioner gets pissed and puts the hats back on, this time with duct tape, and makes them do it again.
they all shake their heads violently back and forth until the hats fall off in front of them. they all call out their hat colors and ask to go home. the executioner gets pissed and puts the hats back on, this time with duct tape, and makes them do it again.
#13 - mr skeltal (07/07/2014) [+] (1 reply)
This is not a question.
#19 to #13 - zyketor (07/07/2014) [-]
Hence why it says "riddle" in the title.
User avatar #71 - samxdaxman (07/08/2014) [-]
A calls out "Green" and gets everyone shot.

Because A is an asshole.
#75 - samoaspider (07/08/2014) [+] (1 reply)
if it was up to me, everybody would just get shot
if it was up to me, everybody would just get shot
#69 - jowiman (07/08/2014) [-]
If B and C were the same colour, D would know what he had and call it.

He doesn't call anything, so C knows he has a different hat to B.

C calls black and everyone lives
User avatar #68 - bothemastaofall (07/08/2014) [-]
It's unsolvable. C could solve it if C knew D existed, but for all C knows, D could be on the other side of the wall.
User avatar #16 - mustakraklsh (07/07/2014) [+] (8 replies)
C knows his hat is black.

He can see that the man in front of him has a white hat, and if his hat were white, D would have already deduced that his hat is white. He also knows (stated in the riddle) that there are four hats, two white and two black.

Since D has not already spoken up, and since the man in front of him has a white hat, he can only have a black hat.

I like these, make more.
#47 - halfdemon (07/08/2014) [-]
i thought i had it solved when i figured that the wall between A and B was between them but further in the background so it isnt blocking A's view. felt foolish when i read the answer
User avatar #7 - shamrockd (07/07/2014) [+] (4 replies)
Man D sees one white, and one black hat in front of him. He has no idea if his hat is black or white. Man C has to realize that if Man D knew what color his hat was, he would call out. If Man D doesn't know what color his hat is, then he must see one of each color of hat. So Man C knows that, since Man D doesn't know what color his own hat is, C's hat must be the opposite color of B's hat. C sees that B's hat is white, so C knows his own hat must be black.
User avatar #97 - epicglitchmane (07/10/2014) [-]
This is stupid, if C knows there are only two white hats and two black hats, and both the white hats are here, that means C should reason he has a black hat, and so does A
User avatar #50 - soupkittenagain ONLINE (07/08/2014) [-]
I knew the answer immediately when I saw this because a similar riddle was done in Sket Dance. The difference is that the people in this riddle are not prisoners.
#34 - chancevance (07/08/2014) [-]
I read the desc wrong and assumed they had to call out the order of the hats each person has on, starting with A. I tried figuring that out, but it's impossible as far as I can tell. I read entername's answer and realized I had read the question wrong.

I would like more of these post, these post are good.
#33 - llllxeallll (07/08/2014) [-]
There is a mirror on both sides of the wall. They can see their own hats
#32 - probstanator ONLINE (07/08/2014) [-]
The solution only makes sense if C knew that D was behind him AND that he was facing his back, AND if he knew that A was on the other side of the wall, all of which he only could know by talking to the others, and if they could talk, they'd mention the color of each other's hats.
User avatar #29 - woddy (07/08/2014) [+] (1 reply)
They know 2 Black and 2 white. D seas black and white on B and C so D yells "White" C see's the 2nd white infront of him and yells "black" since there can only be 2 whites. B hears what C called because he Knows C and D can see his colour so he know's his hat is white ( since c called black and D white C could hear D and saw B) A know's he's white since he heared that 2 whites and one Black is out. (just regocnized that D can't know his own colour just by knowing his front ones so im still posting this comment and come up later how he know's his own colour)
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