Intelligence test

[Fidel_Castronaut]

The answer is obviously C; a spoon.

[I_am_not_mafia]

In my first year at university in my logic course, the lecturer did a little demonstration for us.

He had an embarrassed third year student come in whilst wearing comedy glasses/nose/moustache and carrying a custard pie.

He told us that if he answered the three questions wrongly then the student would put a custard pie in his face.

He answered the three questions correctly and still got the custard pie in his face.

His point was that he only specified what would happen if he answered the questions wrongly, he never said anything about what would happen if he answered them correctly.

The puzzle in the OP only seems to be a puzzle because people assume that one man is always telling the truth and one man must always be telling lies. This is never stated.

[pocaracas]

Guys... here it is.
There are 7 billion people.
3.5 billion of them, at least, tell lies.
3.5 billion of them, at least, say the truth.

That leads to the common saying that half a world is deceiving the other half.

Sadly, reality attests that 1% (or less) of the people are deceiving the rest.

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For the actual thread's charade... both are saying a truth, apparently...
One says something undeniable and the other says that first one is saying something true.

That doesn't mean that they can't lie, at some other time...

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[Alex K]

Hmm, too bad the knight isn't around to improve on the shortcomings of his imprecise language. Does that mean we passed the test and he admits defeat? Did he realize that he is out of his intellectual depth? I will simply assume that until convinced otherwise.

[robvalue]

I think we all won. The answers aren't consistent with the question, or else it's some sort of trick question.

[Homeless Nutter]

Something I cooked up to test your logical thinking skills. Ask any question you feel you need to pertaining to the question.

Two brothers walk up to you.
[...]

"Brothers"? Why is it important, that they're black? Is this supposed to be some sort of a racist joke? 'Cause I don't get it...

[Ben Davis]

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Something I cooked up to test your logical thinking skills. Ask any question you feel you need to pertaining to the question.

Two brothers walk up to you.

Man 1 says "One of us tells lies"

Man 2 says "And one of us tells the truth".

Man one states an undeniable fact.

Which one lies, and which one tells the truth?

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Determine all of what you know, don't think one has to tell lies and one has to tell the truth.

All I know? That's a very open-ended question! I fear that it wouldn't take as long to answer as I would hope

In regard to the presented scenario, all you can deduce, logically, is that Man 1 has provided one 'truthful' statement on one occasion. Your example doesn't contain enough information to progress any further without a series of un/poorly-supported assumptions.

[Jenny A]

The OP sounds like a garbled and not well thought out version of this old nut shell:

You are faced with two doors.  One leads to death, the other to freedom.  You must choose a door.  Outside the doors stand two guards.  One guard always tells the truth, the other always lies.  You don't know which guard is which.  You are allowed a single question to a single guard.  What should you ask?

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You should ask:  

If I asked the other guard which is the door to freedom, what would he say?

If you asked that question of the guard who always lies, he would point to the door that leads to death.
If you asked that question of the guard who always tells the truth, he would also point to the door that leads to death.  Then you could pick the other door and escape.

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There's another solution:

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If I were to ask you which is the door that leads to freedom which door would you point to?

Obviously, the guard who always tells the truth would point to the door that leads to freedom.  But because the question is phrased as what would you say, the guard who always tells lies would have to point at the the door that leads to freedom too as that is the only way to lie about what he would say if asked.

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[Alex K]

@Jenny A

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I got the first myself, but wow I love the second solution! Funneling the truth twice through the same guard in one question to cancel a possible negation is so elegant!

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[Longhorn]

I got 2%, how bout yous