Originally Posted by mr funktastic
You approach two talking doors. One door leads to the City of Truth, while the other door leads to the City of Liars. You do not know which door is which. You are able to ask only one question to determine which door is which. The door that leads to the City of Liars always speaks lies, while the door that leads to the City of Truth always speaks the truth. You want to go to the City of Truth. What question do you ask to determine which door leads to the City of Truth.
I have a couple answers.
The first I thought of was, "I tell them my name, then I ask them what my name is."
The door of truth will speak my name, the door lies will speak another name.
The second was, "Can you talk?"
The door of truth must say yes, the door of lies must say no.
Doh! thats what I get for hitting "quote" and leaving the screen up while I come up with an answer! lol. I was having the same dilema as lemon and came to the same conclusion as well. You have to ask them about something other than themselves. a good riddle, I enjoyed it.[/edit]