• e-gmat Exclusive Offer
    Get 300+ Practice Questions
    25 Video lessons and 6 Webinars for FREE

    Available with Beat the GMAT members only code

    MORE DETAILS
    e-gmat Exclusive Offer
  • examPAL
    Most awarded test prep in the world
    Now free for 30 days

    Available with Beat the GMAT members only code

    MORE DETAILS
    examPAL
  • Magoosh
    Magoosh
    Study with Magoosh GMAT prep

    Available with Beat the GMAT members only code

    MORE DETAILS
    Magoosh
  • Target Test Prep
    5-Day Free Trial
    5-day free, full-access trial TTP Quant

    Available with Beat the GMAT members only code

    MORE DETAILS
    Target Test Prep
  • PrepScholar GMAT
    5 Day FREE Trial
    Study Smarter, Not Harder

    Available with Beat the GMAT members only code

    MORE DETAILS
    PrepScholar GMAT
  • EMPOWERgmat Slider
    1 Hour Free
    BEAT THE GMAT EXCLUSIVE

    Available with Beat the GMAT members only code

    MORE DETAILS
    EMPOWERgmat Slider
  • Economist Test Prep
    Free Trial & Practice Exam
    BEAT THE GMAT EXCLUSIVE

    Available with Beat the GMAT members only code

    MORE DETAILS
    Economist Test Prep
  • Varsity Tutors
    Award-winning private GMAT tutoring
    Register now and save up to $200

    Available with Beat the GMAT members only code

    MORE DETAILS
    Varsity Tutors
  • Veritas Prep
    Free Veritas GMAT Class
    Experience Lesson 1 Live Free

    Available with Beat the GMAT members only code

    MORE DETAILS
    Veritas Prep
  • Kaplan Test Prep
    Free Practice Test & Review
    How would you score if you took the GMAT

    Available with Beat the GMAT members only code

    MORE DETAILS
    Kaplan Test Prep

11. If W +x <0, is w-y>0?

This topic has 14 member replies
mmgmat2008 Junior | Next Rank: 30 Posts Default Avatar
Joined
11 Nov 2008
Posted:
23 messages

11. If W +x <0, is w-y>0?

Post Tue Dec 09, 2008 5:00 am
(1) x+y <0
(2) y Answer b

I got this wrong. why not D for this question?

  • +1 Upvote Post
  • Quote
  • Flag
andy123 Senior | Next Rank: 100 Posts Default Avatar
Joined
20 Sep 2009
Posted:
55 messages
Post Mon Mar 14, 2011 1:58 am
2nd equation is easy:

Question prompt requires us to prooove: w-y > 0

which means: W > y ??

Option B: already gives the olution y

  • +1 Upvote Post
  • Quote
  • Flag
Night reader Legendary Member Default Avatar
Joined
27 Dec 2008
Posted:
1337 messages
Followed by:
10 members
Upvotes:
127
Test Date:
03/28/11
Post Sun Mar 13, 2011 10:33 am
an interesting problem popped up today. I found answer which is not OA cited in the post, please contribute

... this question's title contains part of this DS, so I am copying/pasting the title of the post back into the post Smile
w<-x OR x<-w. Is w>y?
st(1) x<-y --> as x<-w both -w and -y can be greater than y, BUT we don't know if if w>y Not Sufficient;
st(2) y as x<-w and x|x|. If w<0 then w lies to the right from y, i.e. -y<-w. If w>0 then w lies to the left of y again, i.e. y Combined st(1&2): x<-y and y -x>y U x>y suggest y<0 and |x|y and -w>y present (the same condition was met in statement 2 Alone) BUT we need to meet both conditions w>y AND -w<-y

IOM E

Quote:
If W +x <0, is w-y>0?
(1) x+y <0
(2) y
mmgmat2008 wrote:
(1) x+y <0
(2) y Answer b

I got this wrong. why not D for this question?

_________________
My knowledge frontiers came to evolve the GMATPill's methods - the credited study means to boost the Verbal competence. I really like their videos, especially for RC, CR and SC. You do check their study methods at https://www.gmatpill.com

  • +1 Upvote Post
  • Quote
  • Flag
niraj_a Legendary Member Default Avatar
Joined
01 Jun 2008
Posted:
708 messages
Followed by:
1 members
Upvotes:
13
Post Tue Dec 09, 2008 5:35 am
from the stem, they are asking if w > y

statement II gives you that info directly while statement I does not.

what's the source?

  • +1 Upvote Post
  • Quote
  • Flag
hwiya320 Senior | Next Rank: 100 Posts Default Avatar
Joined
02 Sep 2008
Posted:
93 messages
Upvotes:
7
Post Tue Dec 09, 2008 7:19 am
mmgmat2008 wrote:
(1) x+y <0
(2) y Answer b

I got this wrong. why not D for this question?
Stem is stating,
W + X < 0
W < -X or W > X,
asking, is W>Y?

1) x +y < 0
which means x < -Y or -X > Y
so we knew that -X is greater than W, and now we know that -X is greater than Y. That doesn't prove that W is greater than Y.

I think what you did was X > -Y then flip the sign and got rid of negative for ALL numbers, X < Y... I assume that's how you determined that W>Y>X?

This Q is from GMATPrep.

  • +1 Upvote Post
  • Quote
  • Flag
mmgmat2008 Junior | Next Rank: 30 Posts Default Avatar
Joined
11 Nov 2008
Posted:
23 messages
Post Wed Dec 10, 2008 9:19 am
This type of questions is my weakness.
Thanks for the answers. I will try to not make the same mistake tomorrow at my G day!Smile

  • +1 Upvote Post
  • Quote
  • Flag
cramya Legendary Member Default Avatar
Joined
28 Aug 2008
Posted:
2469 messages
Followed by:
11 members
Upvotes:
331
Post Wed Dec 10, 2008 7:34 pm
Think of it this way.

No info about x,y,w are given (may or may not be integers)

Since w+x<0 is given all we know is either both are negative or one of them is negative and other positive with the abolsute value of the negative number greater than the absolute value of the positive number.

Given w+x<0

w+x<0 i.e w< - x Is w-y>0 or w > y

Stmt II(always try to pick the easier of the 2 statements - just my opinion)

y
Exactly what we need w>y

SUFF

Now its down to B) or D) .

This way u have increased the probability of answering the question right (50% prob)


Given w+x<0 i.e w < -x (1)

Stmt I

x+y <0 I.E X< - Y (2)

U can pick numbers here where w > y and where w < y satisfying (1) and (2)


INSUFF


Choose B)

  • +1 Upvote Post
  • Quote
  • Flag
chipbmk Senior | Next Rank: 100 Posts Default Avatar
Joined
05 Oct 2009
Posted:
70 messages
Post Mon Nov 23, 2009 4:02 pm
Why can we not do this for statement 1:

Given: W+X<0

Statement 1: X+Y<0

Given --> X+W<0
Statement 1--> X+Y<0
______ (subtract the statements)
= W-Y<0 or W
Doesnt that give you a definitive "no" to the question is w-y>0? or is w>y? appears like it does to me ... let me know

  • +1 Upvote Post
  • Quote
  • Flag
mehravikas Legendary Member Default Avatar
Joined
12 May 2008
Posted:
1161 messages
Followed by:
1 members
Upvotes:
23
Test Date:
********
Target GMAT Score:
740
Post Tue Nov 24, 2009 6:36 pm
you can never subtract inequalities. you can only add them.

- 1 < 0
-2 < 0
If you add both inequalities you get -3 < 0, which is correct.

If you subtract 2nd statement from 1 i.e.

-1 < 0
-2 < 0
- -
-------

1 < 0 - incorrect

chipbmk wrote:
Why can we not do this for statement 1:

Given: W+X<0

Statement 1: X+Y<0

Given --> X+W<0
Statement 1--> X+Y<0
______ (subtract the statements)
= W-Y<0 or W
Doesnt that give you a definitive "no" to the question is w-y>0? or is w>y? appears like it does to me ... let me know

  • +1 Upvote Post
  • Quote
  • Flag
missrochelle Master | Next Rank: 500 Posts Default Avatar
Joined
09 Jun 2010
Posted:
117 messages
Post Sun Aug 29, 2010 4:22 pm
mehravikas wrote:
you can never subtract inequalities. you can only add them.

- 1 < 0
-2 < 0
If you add both inequalities you get -3 < 0, which is correct.

If you subtract 2nd statement from 1 i.e.

-1 < 0
-2 < 0
- -
-------

1 < 0 - incorrect
[/quote]IF YOU ADD THE INEQUALITY IN STATEMENT 1, TO THE STEM THEN HOW DO YOU GET -3 <1?

W + X < 0
X+ Y < 0
W+2X+Y < 0
WHICH DOESN'T ALLOW YOU TO ISOLATE W-Y..... IS THIS INCORRECT?

  • +1 Upvote Post
  • Quote
  • Flag
andy123 Senior | Next Rank: 100 Posts Default Avatar
Joined
20 Sep 2009
Posted:
55 messages
Post Sun Mar 13, 2011 9:32 am
W + X < 0
W < -X or W > X,
asking, is W>Y?


Stupid Question but please help :

Is it OK to convert:

W < -X --- >> to ---- >> W > X,

I thought if we multiply by -1 , then we have to multiply both the sides of the equations and reverse the inequality ??

so in thi case: W < -X should not it be converted to -W > X ???

Smile

  • +1 Upvote Post
  • Quote
  • Flag
HSPA Legendary Member
Joined
28 Jan 2011
Posted:
1101 messages
Followed by:
13 members
Upvotes:
47
Target GMAT Score:
720
GMAT Score:
640
Post Mon Mar 14, 2011 2:57 am
w-y = w+x-x-y = (w+x)-(x+y)


Now let us use A (x+y <0) : (w+x)-(x+y) = -ve - ( -ve) [INSUFFICIENT]... we dont know how much negitive each fellow is
Now let us use B :
Consider w = 1, x = -2, y = -3
then (W+X)-(X+Y) = -1+5
w= 100, x = -101 then y is more negitive

But now
w= -1, x=0 so w+x <0 then x>y so y = -1... no w>y so y = -2...

Hello All ..... B seems fine for me

  • +1 Upvote Post
  • Quote
  • Flag
Night reader Legendary Member Default Avatar
Joined
27 Dec 2008
Posted:
1337 messages
Followed by:
10 members
Upvotes:
127
Test Date:
03/28/11
Post Mon Mar 14, 2011 3:35 am
Perhaps I got lost in inequality translations, after plug in and with condition given (w+x<0) I figured |x| could not be more than |w| - so B is Sufficient.
thanks

_________________
My knowledge frontiers came to evolve the GMATPill's methods - the credited study means to boost the Verbal competence. I really like their videos, especially for RC, CR and SC. You do check their study methods at https://www.gmatpill.com

  • +1 Upvote Post
  • Quote
  • Flag
ankur.agrawal Master | Next Rank: 500 Posts
Joined
31 Mar 2010
Posted:
261 messages
Followed by:
3 members
Upvotes:
11
Test Date:
23rd April, 2011
Target GMAT Score:
700
GMAT Score:
NA
Post Mon Mar 14, 2011 7:13 am
[quote="mmgmat2008"](1) x+y <0
(2) y Answer b

W+x<0 ; W-y>0 or is W>y ?

1) Take w =-2 & x=-3 y=-4 ; These value satisfies W+x<0 & x+y <0

Is W>y. From Values taken it seems Yes it is.

Lets test another set of values : x=1 ; y=-2 ; w=-3

Is W>y . No . A yes & a No . This Statement is not sufficient.

2) Taking the same value for the first case as above:

Take w =-2 & x=-3 y=-4. These values satisfies y
Is w> y . Yes . Lets check another set of values.

w=2 ; x=-3 ; y=-4. again a yes.

If we use this method i think the answer should be D. lets check algebraically for the 2nd Statement.

W+x <0 ; y
Ist Case : Both Negative : Yes W>y
2nd Case: W + & x - (x has to be more negative than w is positive) = Yes W>y
3rd Case : W- & x+ ( W has to be more negative than x is +)= Yes W>y.

Am i missing sumthing.

I Think B

  • +1 Upvote Post
  • Quote
  • Flag
ankur.agrawal Master | Next Rank: 500 Posts
Joined
31 Mar 2010
Posted:
261 messages
Followed by:
3 members
Upvotes:
11
Test Date:
23rd April, 2011
Target GMAT Score:
700
GMAT Score:
NA
Post Mon Mar 14, 2011 7:15 am
[quote="mmgmat2008"](1) x+y <0
(2) y Answer b

W+x<0 ; W-y>0 or is W>y ?

1) Take w =-2 & x=-3 y=-4 ; These value satisfies W+x<0 & x+y <0

Is W>y. From Values taken it seems Yes it is.

Lets test another set of values : x=1 ; y=-2 ; w=-3

Is W>y . No . A yes & a No . This Statement is not sufficient.

2) Taking the same value for the first case as above:

Take w =-2 & x=-3 y=-4. These values satisfies y
Is w> y . Yes . Lets check another set of values.

w=2 ; x=-3 ; y=-4. again a yes.

If we use this method i think the answer should be D. lets check algebraically for the 2nd Statement.

W+x <0 ; y
Ist Case : Both Negative : Yes W>y
2nd Case: W + & x - (x has to be more negative than w is positive) = Yes W>y
3rd Case : W- & x+ ( W has to be more negative than x is +)= Yes W>y.

Am i missing sumthing.

I Think B

  • +1 Upvote Post
  • Quote
  • Flag

Best Conversation Starters

1 lheiannie07 108 topics
2 ardz24 67 topics
3 Roland2rule 63 topics
4 LUANDATO 52 topics
5 Vincen 51 topics
See More Top Beat The GMAT Members...

Most Active Experts

1 image description GMATGuruNY

The Princeton Review Teacher

150 posts
2 image description Jeff@TargetTestPrep

Target Test Prep

114 posts
3 image description Rich.C@EMPOWERgma...

EMPOWERgmat

105 posts
4 image description Scott@TargetTestPrep

Target Test Prep

101 posts
5 image description Max@Math Revolution

Math Revolution

85 posts
See More Top Beat The GMAT Experts