Mindbender: Truth or Lie?

Another motorist equally lost came to a fork in the road. There was no signpost so he had to ask at a house which was the correct fork to take him to his destination. In the house were two brothers, one of whom always told the truth and other who always lied. When one of them (he didn’t know which) came to the door he could ask him only one question. What is the single question he could ask which would ensure he found out the right road?

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ANSWER

I've heard ones like this before, so I'm sure this one is right.  Ask  "Which way would HE [the other brother] tell me to go, to get to. . . ?"  Then go the other way.  Either the motorist is talking to the lying brother who knows the honest brother would say to go in direction A and therefore the lying brother would lie and say the honest brother would say to go in direction B; or he is talking to the honest brother who would honestly report that his brother, who lies, would say to go in direction B (which would be a lie, so go in direction A).Sent in by Renai McLean

Sent in by Renai McLean

I'm afraid that the answer for # 13 is incorrect!!!  The question states that the motorist can ask only one question.  But it does not state the number of times it can be asked.  Therefore the question that the motorist must ask the brother is "Which is the right road?"  The first time meaning left vs. right, the second time wrong vs. right.  The riddle does not state that the questions cannot be specified, the motorist can tell the brother where he is trying to get to, etc. The brother who always lies would say that the "right" (vs. left) road would be the left road!! Again: "Which is the right road?"Sent in by Bradley Howard

Sent in by Bradley Howard

Sent in by Bradley Howard the answers stated are both incorrect... the person should ask the following. "if the answers stated are both incorrect... the person should ask the following. "if I were to ask the other person, which way would he tell me to go?". If he asked the truth teller, then the truth teller would say the truth, in that the liar person would lie and say the wrong way, so he would say the wrong way as well. So you would choose the opposite. If you asked the liar, since the truth teller would say the right way he must lie so the liar will say the opposite of that as well which of course is the wrong way. In either case they will both point to the wrong way. (Though for different reasons)

Sent in by William Volterman

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