<p>There are 2 rooms, one with a gold treasury.</p>

19.

There are 2 rooms, one with a gold treasury.

There are 2 rooms, one with a gold treasury and another with deadly snakes. Each room is guarded by a security. Among the two, one always speaks the truth and the other false. You can ask only one question to either of the security to identify the room with gold.

Submitted by tartle · Added 17 January 2013 · Updated 5 July 2026

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Solution:

You can ask either guard, 'If I were to ask the other guard which room has the gold, what would he say?' If you ask the truth-teller, he will truthfully report the false guard's lie, leading you to the room with snakes. If you ask the liar, he will lie about the truth-teller's answer, also pointing you to the room with snakes. Therefore, you should choose the opposite room to find the gold treasury.

Comments (2)

TheWickedNinja ★ Solved 3 March 2013

The Question you ask security team 1 is "what would security team 2 tell me is behind your door?" If they said that there is snakes behind security team 1's door then you know that they are lying and there is gold behind that door because if the other team was telling the truth and there is snakes behind the door then the first security team has to lie and tell you there is no snakes. Someone has to speak false so always ask what the other person would say and go with the door that does not have gold.

HighPriest 16 November 2016

You could just ask one of the guards "Is the door with snakes guarded by an honest man?"
If the answer is yes, choose the other door.

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