PS questions and question about the gmat books ! : GMAT Problem Solving (PS)
Check GMAT Club Decision Tracker for the Latest School Decision Releases http://gmatclub.com/AppTrack

 It is currently 20 Jan 2017, 13:40

### GMAT Club Daily Prep

#### 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

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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# PS questions and question about the gmat books !

Author Message
TAGS:

### Hide Tags

Intern
Joined: 18 Jul 2010
Posts: 46
Followers: 0

Kudos [?]: 28 [0], given: 6

### Show Tags

10 Sep 2010, 10:04
00:00

Difficulty:

(N/A)

Question Stats:

50% (02:51) correct 50% (01:30) wrong based on 2 sessions

### HideShow timer Statistics

Hi everyone!
First of all, I would like to say that it's my first post ont he website! However I am registered to the gmatclub for 3 or 4 months now. Oh and also, I am french (that might explain some english mistake I could do ....)

I have 2 questions:

1) gmat quantitative review 2nd edition question 156 (PS)

"If 4< \frac{(7-x)}{3}, which of the following must be true?

I. 5 < x
II. |x+3| > 2
III. -(x+5) >0
"

First of all let's simplify the expression. We obtain : x < -5

I. Obvious that it is not true.
III. Obivous that it is true

II. For me |x + 3| > 2 means that x is in [ -inf; -5] U [-1; +inf]. i.e we don't only have x < -5 which would mean that it is not true (I think).
But as you can see it coming, the answer is that the statement is TRUE. WHY ?????????

I hope I made myself as clear as possible on this question....

2) As I am very studuous, I am working with the three gmat books and the gmatclub tests.
For all the questions of the "gmat quantitative 2nd edition" I got 272/300, i.e. 90.6% (and I am working on a train) which does not seem that bad.
However for the gmatclub test, I am often less than 50% (percentile) and around 9/10 mistakes. My best score is 75%. So as soon as I start doing the gmatclub tests I am feeling really bad, like if I was hopeless....

Is this range normal? Am I hopeless? Could you give me some advice? I am trying to follow some guide posted on the gmat forum as hard as possible but even if I can see some improvements I just reduce my mistakes from 12 to 8 when.

Alex
[Reveal] Spoiler: OA
Math Expert
Joined: 02 Sep 2009
Posts: 36583
Followers: 7087

Kudos [?]: 93280 [0], given: 10555

### Show Tags

10 Sep 2010, 10:26
alexn49 wrote:
Hi everyone!
First of all, I would like to say that it's my first post ont he website! However I am registered to the gmatclub for 3 or 4 months now. Oh and also, I am french (that might explain some english mistake I could do ....)

I have 2 questions:

1) gmat quantitative review 2nd edition question 156 (PS)

"If $$4< \frac{(7-x)}{3}$$, which of the following must be true?

I. 5 < x
II. |x+3| > 2
III. -(x+5) >0
"

First of all let's simplify the expression. We obtain : x < -5

I. Obvious that it is not true.
III. Obivous that it is true

II. For me |x + 3| > 2 means that x is in [ -inf; -5] U [-1; +inf]. i.e we don't only have x < -5 which would mean that it is not true (I think).
But as you can see it coming, the answer is that the statement is TRUE. WHY ?????????

I hope I made myself as clear as possible on this question....

2) As I am very studuous, I am working with the three gmat books and the gmatclub tests.
For all the questions of the "gmat quantitative 2nd edition" I got 272/300, i.e. 90.6% (and I am working on a train) which does not seem that bad.
However for the gmatclub test, I am often less than 50% (percentile) and around 9/10 mistakes. My best score is 75%. So as soon as I start doing the gmatclub tests I am feeling really bad, like if I was hopeless....

Is this range normal? Am I hopeless? Could you give me some advice? I am trying to follow some guide posted on the gmat forum as hard as possible but even if I can see some improvements I just reduce my mistakes from 12 to 8 when.

Alex

Hi, and welcome to Gmat Club.

Please post PS questions in the PS subforum: gmat-problem-solving-ps-140/
Please post DS questions in the DS subforum: gmat-data-sufficiency-ds-141/

Pleas post general math questions in the GMAT Math Questions and Intellectual Discussions subforum: gmat-math-questions-and-intellectual-discussions-7/

If $$4< \frac{(7-x)}{3}$$, which of the following must be true?

I. 5 < x
II. |x+3| > 2
III. -(x+5) >0
"

$$4< \frac{(7-x)}{3}$$ --> $$x<-5$$. This info is given to be TRUE.
The question is: which of the following statements MUST be true, taking into the consideration that $$x<-5$$.

I. $$5 < x$$ --> never true;
III. $$-(x+5) >0$$ --> $$x<-5$$ always true;

As for II. $$|x+3|>2$$: you correctly found the ranges of $$x$$ for which this inequality holds true: $$x<-5$$ or $$x>-1$$. So if $$x<-5$$ or $$x>-1$$ then this inequality holds true. Now, we are told in the stem that $$x<-5$$, so this inequality holds true. Or in another words: $$x$$ could be for example: -6, -7, -10, -11.5, ... ANY such $$x$$, which is less than -5, will satisfy $$|x+3|>2$$.

Hope it's clear.
_________________
Intern
Joined: 18 Jul 2010
Posts: 46
Followers: 0

Kudos [?]: 28 [0], given: 6

### Show Tags

10 Sep 2010, 10:39
Thanks for the quick answer! I thought the statement had to be true over the whole set! Good to know!
And thanks for splitting my subject, sorry for the inconvenience
Math Expert
Joined: 02 Sep 2009
Posts: 36583
Followers: 7087

Kudos [?]: 93280 [0], given: 10555

### Show Tags

10 Sep 2010, 10:51
alexn49 wrote:
Thanks for the quick answer! I thought the statement had to be true over the whole set! Good to know!
And thanks for splitting my subject, sorry for the inconvenience

To elaborate more. We could rephrase the question as "does inequality |x+3| > 2 hold true for x<-5?" The answer is YES, so |x+3| > 2 is true for x<-5.
_________________
Re: PS questions and question about the gmat books !   [#permalink] 10 Sep 2010, 10:51
Similar topics Replies Last post
Similar
Topics:
PS questions and question about the gmat books ! 6 10 Sep 2010, 10:04
1 PS question 2 29 Aug 2010, 06:32
1 PS question 4 16 Aug 2010, 21:49
2 PS question 2 16 Aug 2010, 21:20
238 PS questions about standard deviation. 107 27 Oct 2009, 15:37
Display posts from previous: Sort by