You are on a treasure hunt, wondering where the "Truth Treasure" is buried. You have no idea where it is buried, so you go Truth Town (made up of only Liars and Knights) because it is famous for holding the treasure's secret location.
When you enter the city, you see two twins and they know each other's types, but you don't. One twin says "(Exactly) one of us is a Knight..." and the other twin says "...and (exactly) one of us is a Liar." You can only ask one question and only to one person. You only care about where the treasure is kept, and obviously a liar would give you a wrong answer, so what should you do?
I am lousy at these type puzzles, and that is the truth, but....
If both twins are Knights, then both are lying in their statements, which is a contradiction. If one is a Knight and one is a Liar, then both are telling the truth, which is a contradiction. So both are Liars.
So I guess you could ask Twin A (either one), "If I were to ask Twin B over there where the treasure is buried, what answer could he possibly give me?" Any answer from Twin A other than the true location, would be the truth, and he is a Liar. So Twin A would have to reveal the actual location. (???)
Posted by Penny
on 2005-07-05 05:17:46