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# All of John's friends say they know

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Senior Manager
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All of John's friends say they know  [#permalink]

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Updated on: 26 Jul 2017, 05:31
2
3
00:00

Difficulty:

65% (hard)

Question Stats:

52% (01:18) correct 48% (01:26) wrong based on 827 sessions

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All of John's friends say they know someone who has smoked 40 cigarettes a day for the past 40 years and yet who is really fit and well. John does not know anyone like that and it is quite certain that he is not unique among his friends in this respect.

If the statements in the passage are true, then which one of the following must also be true?

(A) Smokers often lie about how much they smoke.
(B) People often knowingly exaggerate without intending to lie.
(C) All John's friends know the same lifelong heavy smoker.
(D) Most of John's friends are not telling the truth.
(E) Some of John's friends are not telling the truth.

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Originally posted by tenaman10 on 19 Jul 2009, 06:12.
Last edited by broall on 26 Jul 2017, 05:31, edited 1 time in total.
Fixed typo
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Re: All of John's friends say they know  [#permalink]

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28 Mar 2015, 11:32
3
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All of John's friends say they know someone who has smoked 40 cigarettes a day for the past 40 years and yet who is really fit and well. John does not know anyone like that and it is quite certain that he is not unique among his friends in this respect.

If the statements in the passage are true, then which one of the following must also be true?

(A) Smoking often lie about how much they smoke.

(B) People often knowingly exaggerate without intending to lie.

(C) All John's friends know the same lifelong heavy smoker.

(D) Most of John's friends are not telling the truth.

(E) Some of John's friends are not telling the truth.
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Re: All of John s friends say they know someone who has smoked  [#permalink]

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02 Jul 2010, 21:19
8
Hi,

in inference questions that ask for what "must be true?", it is a great strategy to deal with every statement as a fact. A big mistake many people make with this question type is to identify conclusion and evidence. There's no point in doing that.

What you should do is exactly this:

--treat every sentence as a fact, as true--no doubt about it
--see if you can combine the facts to arrive at a deduction
--aggressively scan for a choice that matches that deduction (you don't have to decide whether a choce is right or wrong the first time you read it--you just go through the choices aggressively looking for one that matches your prediction)
--select that choice, not care one whit about the other choices, and move on.

Let's do that here.

The first sentence is pretty easy to understand: All of Jon's friends say they know a heavy smoker who is, yet, healthy. But the second sentence tells us that John doesn't know anyone like that, and we also know it must be true that:

Quote:
it is quite certain that he is not unique among his friends in this respect

Therefore, despite what they "say", at least one of his friends is lying--that's it, that's our deduction.

Let's scan for the match..

Then, choice E clearly matches.

The passage does not establish that all of John's friends know the same life-long smoker. If we deny choice C--if John's friends didin't all know the same smoker--then no part of the passage is falsified. Thus, the passage has not proved that choice C must be true.
##### General Discussion
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Re: All of John's friends say they know  [#permalink]

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19 Jul 2009, 10:55
- Since, John is not unique, some of the friends must not know the smoker, so some of them are lying.

(A) Smoking often lie about how much they smoke.
- No relation.

(B) People often knowingly exaggerate without intending to lie.
- No relation.

(C) All John's friends know the same lifelong heavy smoker.
-'Lifelong heavy smoker' is never mentioned in passage.

(D) Most of John's friends are not telling the truth.
- We can not conclude on 'most' part.

(E) Some of John's friends are not telling the truth.
-My take. This one is the answer.

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Re: All of John's friends say they know  [#permalink]

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Updated on: 19 Jul 2009, 22:02
Hss to be within D or E.

I go with D.. OA pls
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Originally posted by snipertrader on 19 Jul 2009, 20:39.
Last edited by snipertrader on 19 Jul 2009, 22:02, edited 1 time in total.
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Re: All of John's friends say they know  [#permalink]

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19 Jul 2009, 20:46
1
E because "he is not unique" means some of his friends do not know that fact, but the stem says "all of his friends know". So some of his friends must lie...
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Re: All of John's friends say they know  [#permalink]

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20 Jul 2009, 02:23
1
1
Has to be E Since
Arg 1) "All of John's friends say they know someone ..."
Arg 2) "John does not know anyone like that and it is quite certain that he is not unique among his friends in this respect."

Since "all" of John;s friend say they know someone and John believe he doesn't know and he is not "unique" then definetely some of his friends are lying.
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All of John s friends say they know someone who has smoked  [#permalink]

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01 Mar 2010, 11:54
1
5
All of John’s friends say they know someone who has smoked 40 cigarettes a day for the past 40 years and yet who is really fit and well. John does not know anyone like that and it is quite certain that he is not unique among his friends in this respect.

If the statements in the passage are true, then which one of the following must also be true?

(A) Smokers often lie about how much they smoke.
(B) People often knowingly exaggerate without intending to lie.
(C) All John’s friends know the same lifelong heavy smoker.
(D) Most of John’s friends are not telling the truth.
(E) Some of John’s friends are not telling the truth.
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Re: All of John s friends say they know someone who has smoked  [#permalink]

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Updated on: 02 Mar 2010, 14:28
1
i thought it was among B, D, and E. since "most" and "some" seem pretty strong, i figured it would be B.

as far as C, the stimulus says that John doesn't know anyone who smokes in such a manner and he is sure that not ALL of his friends know someone who does. so in this respect, at least 1 of his friends does not know anyone who smokes 40 cigs a day neither. therefore, the idea that ALL of his friends know the same smoker must be false. this is my reason for disregarding C.

anyone know why its E? what is the difference (at least by gmat standards) between "most" and "some"?
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Originally posted by azule45 on 01 Mar 2010, 14:39.
Last edited by azule45 on 02 Mar 2010, 14:28, edited 1 time in total.
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Re: All of John s friends say they know someone who has smoked  [#permalink]

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02 Mar 2010, 13:54
2
1
vaivish1723 wrote:
All of John’s friends say they know someone who has smoked 40 cigarettes a day for the past 40 years and yet who is really fit and well. John does not know anyone like that and it is quite certain that he is not unique among his friends in this respect.
If the statements in the passage are true, then which one of the following must also be true?
(A) Smokers often lie about how much they smoke.
(B) People often knowingly exaggerate without intending to lie.
(C) All John’s friends know the same lifelong heavy smoker.
(D) Most of John’s friends are not telling the truth.
(E) Some of John’s friends are not telling the truth.

Oa is

Why cant c be OA?

I first opted for C.
But i think there is a valid logic behind E.

C can be rejected on the basis of the premise that John is not unique, means he is not the only guy who doesn't know heavy smoker.

Let's say there are 10 guys including John. If we choose option C, it means 9 guys know heavy smoker and John becomes unique.

In option E, lets say 7 guys know (they say so)heavy smoker, and 2 are just lying for one reason or another, but they say they know, then actually John is not the only one who doesn't know the heavy smoker. And also the condition that "All of John’s friends say they know someone who has smoked 40 cigarettes a day for the past 40 years and yet who is really fit and well" is fulfilled.

FINALLY E.
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Re: All of John s friends say they know someone who has smoked  [#permalink]

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02 Mar 2010, 18:41
1
It has to be E. Statement says that "All of John’s friends say", then it indicates that "John does not know anyone like that and it is quite certain that he is not unique among his friends in this respect". That means that some of John's friends are untruthful. Most will not work as we don't know how many.
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Re: All of John s friends say they know someone who has smoked  [#permalink]

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04 Mar 2010, 21:05
if jhon is not unique then he is more likely to similar to his friends in all aspects

if jhon his telling the truth then most of his friends will also tell truth

so ans E is the correct answer
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Re: All of John s friends say they know someone who has smoked  [#permalink]

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05 Mar 2010, 03:46
John does not know anyone like that and it is quite certain that he is not unique among his friends in this respect.
=> John and some of his friends do not Know of a person who had been smoking ...etc etc

Option E clearly follows from this statement.
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Re: All of John s friends say they know someone who has smoked  [#permalink]

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02 Jul 2010, 14:56
Thanks boss...well explained yet again..

nverma wrote:
vaivish1723 wrote:
All of John’s friends say they know someone who has smoked 40 cigarettes a day for the past 40 years and yet who is really fit and well. John does not know anyone like that and it is quite certain that he is not unique among his friends in this respect.
If the statements in the passage are true, then which one of the following must also be true?
(A) Smokers often lie about how much they smoke.
(B) People often knowingly exaggerate without intending to lie.
(C) All John’s friends know the same lifelong heavy smoker.
(D) Most of John’s friends are not telling the truth.
(E) Some of John’s friends are not telling the truth.

Oa is

Why cant c be OA?

I first opted for C.
But i think there is a valid logic behind E.

C can be rejected on the basis of the premise that John is not unique, means he is not the only guy who doesn't know heavy smoker.

Let's say there are 10 guys including John. If we choose option C, it means 9 guys know heavy smoker and John becomes unique.

In option E, lets say 7 guys know (they say so)heavy smoker, and 2 are just lying for one reason or another, but they say they know, then actually John is not the only one who doesn't know the heavy smoker. And also the condition that "All of John’s friends say they know someone who has smoked 40 cigarettes a day for the past 40 years and yet who is really fit and well" is fulfilled.

FINALLY E.
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Re: All of John s friends say they know someone who has smoked  [#permalink]

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02 Jul 2010, 23:11
Hi TestLuv - kudos to your clarity of thought. I wish I had the time so I would have compiled these nuggets into a CR 101. Well... at some point perhaps... I am scheduled for 9th Aug 2010.
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Re: All of John s friends say they know someone who has smoked  [#permalink]

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03 Jul 2010, 07:11
Testluv wrote:
Hi,

in inference questions that ask for what "must be true?", it is a great strategy to deal with every statement as a fact. A big mistake many people make with this question type is to identify conclusion and evidence. There's no point in doing that.

What you should do is exactly this:

--treat every sentence as a fact, as true--no doubt about it
--see if you can combine the facts to arrive at a deduction
--aggressively scan for a choice that matches that deduction (you don't have to decide whether a choce is right or wrong the first time you read it--you just go through the choices aggressively looking for one that matches your prediction)
--select that choice, not care one whit about the other choices, and move on.

Let's do that here.

The first sentence is pretty easy to understand: All of Jon's friends say they know a heavy smoker who is, yet, healthy. But the second sentence tells us that John doesn't know anyone like that, and we also know it must be true that:

Quote:
it is quite certain that he is not unique among his friends in this respect

Therefore, despite what they "say", at least one of his friends is lying--that's it, that's our deduction.

Let's scan for the match..

Then, choice E clearly matches.

The passage does not establish that all of John's friends know the same life-long smoker. If we deny choice C--if John's friends didin't all know the same smoker--then no part of the passage is falsified. Thus, the passage has not proved that choice C must be true.

deserves kudos.!
+1 from me
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Re: All of John s friends say they know someone who has smoked  [#permalink]

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06 Jul 2010, 10:34
I went for D but now clearly understand that it should be E.
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Re: All of John s friends say they know someone who has smoked  [#permalink]

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06 Jul 2010, 19:39
marked B ...but I undrstand its E thnx
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Re: All of John s friends say they know someone who has smoked  [#permalink]

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07 Jul 2010, 15:20
Testluv wrote:
Hi,

in inference questions that ask for what "must be true?", it is a great strategy to deal with every statement as a fact. A big mistake many people make with this question type is to identify conclusion and evidence. There's no point in doing that.

What you should do is exactly this:

--treat every sentence as a fact, as true--no doubt about it
--see if you can combine the facts to arrive at a deduction
--aggressively scan for a choice that matches that deduction (you don't have to decide whether a choce is right or wrong the first time you read it--you just go through the choices aggressively looking for one that matches your prediction)
--select that choice, not care one whit about the other choices, and move on.

Let's do that here.

The first sentence is pretty easy to understand: All of Jon's friends say they know a heavy smoker who is, yet, healthy. But the second sentence tells us that John doesn't know anyone like that, and we also know it must be true that:

Quote:
it is quite certain that he is not unique among his friends in this respect

Therefore, despite what they "say", at least one of his friends is lying--that's it, that's our deduction.

Let's scan for the match..

Then, choice E clearly matches.

The passage does not establish that all of John's friends know the same life-long smoker. If we deny choice C--if John's friends didin't all know the same smoker--then no part of the passage is falsified. Thus, the passage has not proved that choice C must be true.

Nicely done, Kudos for you:)
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Re: All of John s friends say they know someone who has smoked  [#permalink]

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08 Jul 2010, 02:45
E looks fine to me but at the same time A can also be a contender. Expert pls advise what is wrong with A?
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Re: All of John s friends say they know someone who has smoked &nbs [#permalink] 08 Jul 2010, 02:45

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