Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized for You

we will pick new questions that match your level based on your Timer History

Track Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

It appears that you are browsing the GMAT Club forum unregistered!

Signing up is free, quick, and confidential.
Join other 500,000 members and get the full benefits of GMAT Club

Registration gives you:

Tests

Take 11 tests and quizzes from GMAT Club and leading GMAT prep companies such as Manhattan GMAT,
Knewton, and others. All are free for GMAT Club members.

Applicant Stats

View detailed applicant stats such as GPA, GMAT score, work experience, location, application
status, and more

Books/Downloads

Download thousands of study notes,
question collections, GMAT Club’s
Grammar and Math books.
All are free!

Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:

A puzzle closer to Gmat logic. I think I encountered a [#permalink]

Show Tags

16 Mar 2004, 20:41

00:00

A

B

C

D

E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct
0% (00:00) wrong based on 0 sessions

HideShow timer Statistics

A puzzle closer to Gmat logic. I think I encountered a similar one of the gmat800 tests(?).

----------------------
Two men stand at a fork in the road. One fork leads to place X; the other fork leads to place Y. One of these people always answers the truth to any yes/no question which is asked of him. The other always lies when asked any yes/no question. By asking one yes/no question, can you determine the road to X?

Ask any of them this question:
What will the other say if I asked him whether the left fork leads to place X?
If you talked to the one who always lies:
If he says that the one who tells the truth will say yes, then you would know that it's not true because he lies. Thus, left fork will NOT lead to place X.
If you talked to the one who always says the truth:
If he says that the one who tells a lie will say yes, then it MUST be true that the other person must tell a lie and left fork will then NOT lead to place X.
Thus, in above instances, when BOTH say yes, you would take other route! It logically follows that when both say no, you would take the left fork as the one going to place X
_________________

If I ask you whether the left road leads to place X, will you answer, yes?

In any case you"ll get the right direction.

If the one who lies says yes, then you would know that answer is no.
If the one who says the truth says yes, then you would know answer is yes. Now, in this instance, both of them said yes but outcome is different. Since you don't know which one you talked to, how would you know if it's the one, the one who lies or who says the truth, whom you talked to? Since outcomes are different, you cannot ask your question.
_________________

If I ask you whether the left road leads to place X, will you answer, yes?

In any case you"ll get the right direction.

If the one who lies says yes, then you would know that answer is no. If the one who says the truth says yes, then you would know answer is yes. Now, in this instance, both of them said yes but outcome is different. Since you don't know which one you talked to, how would you know if it's the one, the one who lies or who says the truth, whom you talked to? Since outcomes are different, you cannot ask your question.

Actually I agree with Agent_777's qs.
Assume the road to left is indeed leads to X. Now if you ask the person who lies, the qs whether the left road leads to X, he has to answer 'No'. But the question is whether he will answer yes to this question. Again as he has to lie, he has to say 'yes'.
Ask the question to a person who tells the truth, he also will answer yes. Thus doesnt matter whom you ask, the answer will tell you whether the road to left leads to X.

Thus if the answer is yes, the road to left leads to X, if the answer is no, the road to right leads to X.

If I ask you whether the left road leads to place X, will you answer, yes?

In any case you"ll get the right direction.

If the one who lies says yes, then you would know that answer is no. If the one who says the truth says yes, then you would know answer is yes. Now, in this instance, both of them said yes but outcome is different. Since you don't know which one you talked to, how would you know if it's the one, the one who lies or who says the truth, whom you talked to? Since outcomes are different, you cannot ask your question.

Actually I agree with Agent_777's qs. Assume the road to left is indeed leads to X. Now if you ask the person who lies, the qs whether the left road leads to X, he has to answer 'No'. But the question is whether he will answer yes to this question. Again as he has to lie, he has to say 'yes'. Ask the question to a person who tells the truth, he also will answer yes. Thus doesnt matter whom you ask, the answer will tell you whether the road to left leads to X.

Thus if the answer is yes, the road to left leads to X, if the answer is no, the road to right leads to X.

Nice, I overlooked that solution. However, did you check my solution as well? I stand my ground that my solution will always give you the right answer as well. Test it.
_________________

It’s quickly approaching two years since I last wrote anything on this blog. A lot has happened since then. When I last posted, I had just gotten back from...

Since my last post, I’ve got the interview decisions for the other two business schools I applied to: Denied by Wharton and Invited to Interview with Stanford. It all...

Marketing is one of those functions, that if done successfully, requires a little bit of everything. In other words, it is highly cross-functional and requires a lot of different...