There is a land where every inhabitant is either a day-knight or a night-knight. Day-knights tell the truth in the day and lie at night. Night-knights lie in the day and tell the truth at night.
There are two inhabitants A and B, one of whose name is Santos and the name of the other is Shane.
It is known that, Shane is a day knight and Santos is a night knight.
A says that B is Shane.
Is it day or night?
(In reply to
re: Solution by Ady TZIDON)
Perhaps you misread what I wrote.
Saying "the other person is Shane" is equivalent to saying "I am a night-knight." I haven't said anything about whether or not the person is lying.
We already know that Shane is a day-night and Santos is a night-knight, so if someone says, "the other person is Shane," they are also saying, "I am Santos," and equivalently saying, "I am a night-knight."
So the puzzle is effectively reduced to this:
There is a land where every inhabitant is either a day-knight or a night-knight. Day-knights tell the truth in the day and lie at night. Night-knights lie in the day and tell the truth at night.
An inhabitant says, "I am a night-knight."
Is it day or night?
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Posted by tomarken
on 2014-05-02 12:24:18 |