Find all School-related info fast with the new School-Specific MBA Forum

It is currently 16 Apr 2014, 08:21

Hurry Up:

Last day of registration for Dealing with a Ding - Webinar by GMATClub and Admissionado Consulting.


Close

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
Your Progress

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

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

GMATClub Tests M28-03

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
Intern
Intern
Joined: 26 Dec 2011
Posts: 4
Followers: 0

Kudos [?]: 0 [0], given: 3

CAT Tests
GMATClub Tests M28-03 [#permalink] New post 19 Dec 2013, 17:02
00:00
A
B
C
D
E

Difficulty:

  35% (medium)

Question Stats:

66% (02:09) correct 33% (01:10) wrong based on 6 sessions
If x \neq y and y = \frac{x^2-y^2}{x-y}, then what is the value of y?

1) x+y = 3

2) x(y-3) = 0

[Reveal] Spoiler:
A



My question is why not D? below is my logic

Through manipulation we get:
y = (x+y)
Thus, x = 0 and y = (x+y)

Statement 1 gives the very value of x+y. Sufficient.
Statement 2 prompts two scenarios:
x(y-3) = 0

x= 0
OR
(y-3) = 0

Scenario A
X = 0

OR

Scenario B
Y = 3

From Scenario A we find that if X = 0, y can take any value

From Scenarios B we find that if y = 3, then x can take any value; BUT since we know from the question stem that X has to be equal to zero then if Y = 3, X = 0.
So now looking back at Scenario A, if X = 0, then y *cannot* take any value because it must be equal to 3. Hence D.
[Reveal] Spoiler: OA
Math Expert
User avatar
Joined: 02 Sep 2009
Posts: 17283
Followers: 2867

Kudos [?]: 18328 [0], given: 2345

GMAT Tests User CAT Tests
Re: GMATClub Tests M28-03 [#permalink] New post 19 Dec 2013, 23:28
Expert's post
NateTheGreat11 wrote:
If x \neq y and y = \frac{x^2-y^2}{x-y}, then what is the value of y?

1) x+y = 3

2) x(y-3) = 0

[Reveal] Spoiler:
A



My question is why not D? below is my logic

Through manipulation we get:
y = (x+y)
Thus, x = 0 and y = (x+y)

Statement 1 gives the very value of x+y. Sufficient.
Statement 2 prompts two scenarios:
x(y-3) = 0

x= 0
OR
(y-3) = 0

Scenario A
X = 0

OR

Scenario B
Y = 3

From Scenario A we find that if X = 0, y can take any value

From Scenarios B we find that if y = 3, then x can take any value; BUT since we know from the question stem that X has to be equal to zero then if Y = 3, X = 0.
So now looking back at Scenario A, if X = 0, then y *cannot* take any value because it must be equal to 3. Hence D.


That's not correct. Why cannot y be 1 for (2)? Or 0, or 100?
_________________

NEW TO MATH FORUM? PLEASE READ THIS: ALL YOU NEED FOR QUANT!!!

PLEASE READ AND FOLLOW: 11 Rules for Posting!!!

RESOURCES: [GMAT MATH BOOK]; 1. Triangles; 2. Polygons; 3. Coordinate Geometry; 4. Factorials; 5. Circles; 6. Number Theory; 7. Remainders; 8. Overlapping Sets; 9. PDF of Math Book; 10. Remainders; 11. GMAT Prep Software Analysis NEW!!!; 12. SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) NEW!!!; 12. Tricky questions from previous years. NEW!!!;

COLLECTION OF QUESTIONS:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS ; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
25 extra-hard Quant Tests

Re: GMATClub Tests M28-03   [#permalink] 19 Dec 2013, 23:28
    Similar topics Author Replies Last post
Similar
Topics:
New posts Experts publish their posts in the topic Gmatclub tests bibha 3 08 Jul 2010, 03:59
New posts Experts publish their posts in the topic GMATClub tests inghelram 1 03 Apr 2012, 13:20
New posts Experts publish their posts in the topic GMATCLUB TEST joelord2 1 24 May 2013, 22:43
New posts Gmatclub tests monirjewel 0 20 Nov 2013, 01:23
New posts Gmatclub tests admissionseeker 0 27 Nov 2013, 02:09
Display posts from previous: Sort by

GMATClub Tests M28-03

  Question banks Downloads My Bookmarks Reviews Important topics  

Moderators: Bunuel, WoundedTiger



GMAT Club MBA Forum Home| About| Privacy Policy| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group and phpBB SEO

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.