A milepost on the towpath read 21 on the side facing the : GMAT Critical Reasoning (CR)
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A milepost on the towpath read 21 on the side facing the

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A milepost on the towpath read 21 on the side facing the [#permalink]

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New post 21 Jan 2008, 21:25
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Official Guide for GMAT Verbal Review, 2nd Edition

Practice Question
Question No.: 61
Page: 140
Difficulty:


A milepost on the towpath read “21” on the side facing the hiker as she approached it and “23” on its back. She reasoned that the next milepost forward on the path would indicate that she was halfway between one end of the path and the other. However, the milepost one mile further on read “20” facing her and “24” behind.

Which of the following, if true, would explain the discrepancy described above?


(A) The numbers on the next milepost had been reversed.
(B) The numbers on the mileposts indicate kilometers, not miles.
(C) The facing numbers indicate miles to the end of the path, not miles from the beginning.
(D) A milepost was missing between the two the hiker encountered.
(E) The mileposts had originally been put in place for the use of mountain bikers, not for hikers.
[Reveal] Spoiler: OA

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Re: CR-confused [#permalink]

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New post 22 Jan 2008, 13:00
I would answer C.

As the number facing is decreasing, it means the distance remaining is decreasing and vice versa the other num is increasing that she has covered one more unit of distance.
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Re: CR-confused [#permalink]

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New post 22 Jan 2008, 13:36
I second C. That seems to be the standard way of marking mileposts on highways.
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Re: CR-confused [#permalink]

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New post 22 Jan 2008, 14:12
sondenso wrote:
A milepost on the towpath read “21” on the side facing the hiker as she approached it and “23” on its back. She reasoned that the next milepost forward on the path would indicate that she was halfway between one end of the path and the other. However, the milepost one mile further on read “20” facing her and “24” behind.

Which of the following, if true, would explain the discrepancy described above?
(A) The numbers on the next milepost had been reversed. If numbers have been reversed, it's not only on 'next milepost' but on both of them -> Eliminate it
(B) The numbers on the mileposts indicate kilometers, not miles. ... don't need to explain why I eliminate it!
(C) The facing numbers indicate miles to the end of the path, not miles from the beginning. logical answer; the distance to the end the path is decreasing each mile -> Hold it
(D) A milepost was missing between the two the hiker encountered. "the milepost one mile further"... so every milestone is at the right place, no one is missing. -> eliminate it
(E) The mileposts had originally been put in place for the use of mountain bikers, not for hikers. this one is fun but... eliminate it!



-> C :)
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Re: CR-confused [#permalink]

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New post 22 Jan 2008, 21:08
Another C
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Re: CR-confused [#permalink]

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New post 22 Jan 2008, 21:25
How about the following CR question ??

11-t58442

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Re: CR-confused [#permalink]

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New post 22 Jan 2008, 21:57
sondenso wrote:
A milepost on the towpath read “21” on the side facing the hiker as she approached it and “23” on its back. She reasoned that the next milepost forward on the path would indicate that she was halfway between one end of the path and the other. However, the milepost one mile further on read “20” facing her and “24” behind.

Which of the following, if true, would explain the discrepancy described above?


(A) The numbers on the next milepost had been reversed.[wrong eliminate]
(B) The numbers on the mileposts indicate kilometers, not miles. [ wrong eliminate]
(C) The facing numbers indicate miles to the end of the path, not miles from the beginning. [ logical]
(D) A milepost was missing between the two the hiker encountered. [ don't feel in the logical gap -eliminate]
(E) The mileposts had originally been put in place for the use of mountain bikers, not for hikers.[ irrelevant -eliminate]

so C
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Re: CR-confused [#permalink]

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New post 23 Jan 2008, 00:28
Thank all of you guys, paradox is a nightmare for me, do you have any tips for this?
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A milepost on the towpath read 21 on the side facing the [#permalink]

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New post 12 Sep 2009, 21:21
A milepost on the towpath read"21"on the side facing the hiker as she approached it and"23"on its back.She reasoned that the next milepost forward on the path would indicate that she was halfway between one end of the path and the other. However, the milepost one mile further on read"20"facing her and"24"behind.

Which of the following,if true,would explain the discrepancy described above?

(A) The numbers on the next milepost had been reversed.
(B) The numbers on the mileposts indicate kilometers,not miles.
(C) The facing numbers indicate miles to the end of the path.not miles from the beginning.
(D) A milepost was missing between the two the hiker encountered.
(E) The mileposts had originally been put in place for the use of mountain bikers,not for hikers.
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pual wrote:
A milepost on the towpath read"21"on the side facing the hiker as she approached it and"23"on its back.She reasoned that the next milepost forward on the path would indicate that she was halfway between one end of the path and the other. However, the milepost one mile further on read"20"facing her and"24"behind.

Which of the following,if true,would explain the discrepancy described above?

(A) The numbers on the next milepost had been reversed.
(B) The numbers on the mileposts indicate kilometers,not miles.
(C) The facing numbers indicate miles to the end of the path.not miles from the beginning.
(D) A milepost was missing between the two the hiker encountered.
(E) The mileposts had originally been put in place for the use of mountain bikers,not for hikers.


I'm not sure I understand this problem, specially the hiker's reasoning part. So I will go by POE.

A: Maybe. Let's keep it for now.
B: Irrelevant, unit won't make a difference in this case.
C: This sounds reasonable, because from the problem description it vaguely seems that the hiker was expecting the numbers to be in a certain order, but in fact it's reversed. Strong candidate, let's keep this for now.
D: Maybe, maybe not. But it doesn't change the dist, or direction.
E: Irrelevant.

Between, A & C, C looks the best. So C for me.
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New post 13 Sep 2009, 01:10
good explanation buddy...thanks...!!!
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A milepost on the towpath read 21 on the side facing the [#permalink]

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New post 24 Jul 2010, 10:28
A milepost on the towpath read “21” on the side facing the hiker as she approached it and “23” on its back. She reasoned that the next milepost forward on the path would indicate that she was halfway between one end of the path and the other. However, the milepost one mile further on read “20” facing her and “24” behind.

Which of the following, if true, would explain the discrepancy described above?
(A) The numbers on the next milepost had been reversed.
(B) The numbers on the mileposts indicate kilometers, not miles.
(C) The facing numbers indicate miles to the end of the path, not miles from the beginning.
(D) A milepost was missing between the two the hiker encountered.
(E) The mileposts had originally been put in place for the use of mountain bikers, not for hikers.
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Re: Critical Reasoning [#permalink]

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New post 24 Jul 2010, 12:27
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New post 26 Jul 2010, 00:29
I pick C.

It is exactly as C said, nothing more to add.
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New post 26 Jul 2010, 21:03
C
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New post 29 Apr 2011, 09:20
C clearly explains the so called paradox
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Re: A milepost on the towpath read 21 on the side facing the [#permalink]

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New post 24 Mar 2012, 14:06
I have chosen the answer C for this question:

You can almost think of this question like a basic math problem. You know that the total distance of the hike is 44 miles. If this individual hikes and sees 21 on the front of the milepost and 23 on the back, you probably won't be sure what those numbers mean. However, after you hike some more and see 20 on the front and 24 on the back, it should tell you that you have just walked 1 mile and that the number on the front tells you remaining distance, not distance traveled.

A. This answer choice would be incorrect because the next sign should only be a 1 mile difference, yet we would have 21 and 24 as the milepost readings.

B. The unit of measurement is not important

C. This is the correct answer and it definitely resolves the paradox.

D. This doesn't make much sense because what milepost would be in between 21 and 20?

E. Who the milepost was put in for is irrelevant.
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Re: A milepost on the towpath read 21 on the side facing the [#permalink]

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New post 27 May 2013, 00:51
Can someone please provide detailed explanation! Thanks!
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Re: A milepost on the towpath read 21 on the side facing the [#permalink]

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fozzzy wrote:
Can someone please provide detailed explanation! Thanks!


A milepost on the towpath read “21” on the side facing the hiker as she approached it and “23” on its back. She reasoned that the next milepost forward on the path would indicate that she was halfway between one end of the path and the other. However, the milepost one mile further on read “20” facing her and “24” behind.

Which of the following, if true, would explain the discrepancy described above?

The correct answer will resolve the "paradox", we can discard

(B) The numbers on the mileposts indicate kilometers, not miles. - this would make no difference
(E) The mileposts had originally been put in place for the use of mountain bikers, not for hikers. - this would make no difference

We are left with

(A) The numbers on the next milepost had been reversed.
(C) The facing numbers indicate miles to the end of the path, not miles from the beginning.
(D) A milepost was missing between the two the hiker encountered.

The milepost has a side with "21"(other side "23").She is running and thinks a "22" will follow

However a 20 is on the next milepost, with a 24 on its back.

In her logic the numbers increase 21+1=22 so this count is the number of miles she has run. (=miles from the beginning)
In her path she encounters a decrease 21-1=20 so the actual number does not represent the miles she has run, but the miles LEFT to run.(=miles to the end of the path)

Example: 10 miles
10-9-8-7-6-5-4-3-2-1 Miles to the end=> decrease
1-2-3-4-5-6-7-8-9-10 Miles from the beg.=> increase
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Re: A milepost on the towpath read 21 on the side facing the [#permalink]

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