Quote:
Originally Posted by issybird
So everyone knows s/he's wearing a red hat and they all leave at 16:00.
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Indeed they leave at 16.00. That was quickly solved.
At 11.55 everybody knows there is at least one red hat in the room. If it were the only red hat, the person wearing it would leave at 12.00.
Since nobody leaves at 12.00, there must be at least two red hats in the room. If it were only two red hats, the two persons wearing them would leave at 13.00
etc.
Over to you, Issybird