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gmat prep question

This topic has 4 member replies
yvonne12 Master | Next Rank: 500 Posts Default Avatar
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gmat prep question

Post Wed Apr 25, 2007 11:31 am
Elapsed Time: 00:00
  • Lap #[LAPCOUNT] ([LAPTIME])
    if y>0 what is the value of X?

    1. Ix-3I > y

    2. Ix-3I < -y

    please explain to me, how one would approach this kind of question

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    jayhawk2001 Community Manager
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    Post Wed Apr 25, 2007 8:33 pm
    yvonne12 wrote:
    if y>0 what is the value of X?

    1. Ix-3I > y

    2. Ix-3I < -y

    please explain to me, how one would approach this kind of question
    Basic idea is that a modulus of a number can only be positive.

    I recall seeing this question earlier and the second option was
    |x-3| <= -y. I think you have left out the "=" part in 2.

    1 - insufficient. x-3 > 0 implies x> 3. No unique value

    2 - sufficient. |x-3| cannot be < 0. So it can only be = 0. So x = 3

    Hence B.

    yvonne12 Master | Next Rank: 500 Posts Default Avatar
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    Post Wed Apr 25, 2007 9:08 pm
    honestly I dont get it,why can't Ix-3I be negative? I dont understand absolute values in these kinds of problems... could you perhaps elaborate some more about these kinds of questions..I would appreciate it, since my test is on saturday and who knows if I might see this kind of question...


    BTW, are you a monitor or someone that is also studying for the GMAT?. You have been answering all the questions I've been throwing out there, not that I have a problem with it...just curious. Im wondering how you know all this stuff. I've been studying for this exam for the past several months and even though I've been scoring high on the gmat prep, I still worry about this saturday (test day)....

    jayhawk2001 Community Manager
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    Post Wed Apr 25, 2007 9:28 pm
    yvonne12 wrote:
    honestly I dont get it,why can't Ix-3I be negative? I dont understand absolute values in these kinds of problems... could you perhaps elaborate some more about these kinds of questions..I would appreciate it, since my test is on saturday and who knows if I might see this kind of question...
    If you have OG-11, please check page 126 section 9.

    The absolute value of x, denoted by |x| is defined to be x if x>=0
    and -x if x < 0.

    Either way, |x| is positive. Basically modulus of x is the absolute
    distance between x and 0 on the number line. This value is
    always positive just like distances Smile.

    I've seen 3 main concepts on GMATprep and other materials with
    respect to modulus --

    1. Finding value of -x|x|. This is simple if you know that |x| is always
    positive and so the sign of -x determines the end result.

    2. |x+y| <= |x| + |y|

    3. Finding the value or range of |x - n |. In this case, you'll have to
    assume that the "value" of x-n is always positive.

    Now, if x is negative, x-n is negative and this is not permitted as
    per modulus. So, |x-n| now becomes -(x-n)

    If x is positive (and greater than n), |x-n| = x-n

    I hope this helps.

    yvonne12 wrote:
    BTW, are you a monitor or someone that is also studying for the GMAT?. You have been answering all the questions I've been throwing out there, not that I have a problem with it...just curious. Im wondering how you know all this stuff. I've been studying for this exam for the past several months and even though I've been scoring high on the gmat prep, I still worry about this saturday (test day)....
    I'm just a member trying to learn and help wherever I can. Haven't
    taken the GMAT yet - so I'm still in learning mode Smile.

    Good luck with your exams and hey give it your best shot !

    f2001290 Master | Next Rank: 500 Posts
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    Post Thu Apr 26, 2007 6:21 am
    hi yvonne

    i feel that sth is wrong with 2nd statement.

    Modulus is always positive. So |X-3| cannot be <= -y;

    Could you please check out the statemnet again.

    All the best for your exam.

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