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"
Answer :
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.
Thank you in advance if you can answer my questions,
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/I split your post. Second part of your question is at:
ps-questions-and-question-about-the-gmat-books-100808.html#p779132As for your PS question:
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 \(|x+3|>2\).
Answer: II and III.
Hope it's clear.