Find all School-related info fast with the new School-Specific MBA Forum
Learn more about the recent changes... close

It is currently 21 May 2013, 06:56
Customize  |  Hide

Search
Register
New posts
Unanswered

is there a typo in this Q because it doesnt make any sense!!

  Question banks Downloads My Bookmarks Reviews  
  Oldest Best Reply
Search for:
 
Print view
First unread post
Author Message
TAGS:
Intern
Intern
Joined: 09 Nov 2009
Posts: 20
Followers: 0

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

is there a typo in this Q because it doesnt make any sense!! [#permalink] New post 10 Nov 2009, 06:59
00:00

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
If x=y≠4 and x=20-y, thenx^2 - y^2 = ?

A- 16
B - 80
C - 144
D - 256
E - 384

The Q doesnt make sense .. if x=y then the result would be 0 ... is there a typo in the problem collection? Correct should be B (according to the book)

Thanks for ur help!

Last edited by elinka on 10 Nov 2009, 07:16, edited 1 time in total.
VP
VP
Joined: 05 Mar 2008
Posts: 1489
Followers: 10

Kudos [?]: 164 [0], given: 31

GMAT Tests User
Re: is there a typo in this Q because it doesnt make any sense!! [#permalink] New post 10 Nov 2009, 07:06
elinka wrote:
If x=y(sign for different from)4 and x=20-y, then x^2 - y^2 = ?

A- 16
B - 80
C - 144
D - 256
E - 384

The Q doesnt make sense .. if x=y then the result would be 0 ... is there a typo in the problem collection? Correct should be B (according to the book)

Thanks for ur help!


If x=y(sign for different from)4

What does that mean?
VP
VP
Joined: 05 Mar 2008
Posts: 1489
Followers: 10

Kudos [?]: 164 [0], given: 31

GMAT Tests User
Re: is there a typo in this Q because it doesnt make any sense!! [#permalink] New post 10 Nov 2009, 07:10
elinka wrote:
If x=y(sign for different from)4 and x=20-y, then x^2 - y^2 = ?

A- 16
B - 80
C - 144
D - 256
E - 384

The Q doesnt make sense .. if x=y then the result would be 0 ... is there a typo in the problem collection? Correct should be B (according to the book)

Thanks for ur help!


the only think i can figure is
x^2 - y^2 = (x+y)(x-y)

x + y = 20
x - y = 4

80 = answer
Intern
Intern
Joined: 09 Nov 2009
Posts: 20
Followers: 0

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

Re: is there a typo in this Q because it doesnt make any sense!! [#permalink] New post 10 Nov 2009, 07:14
it means .. x is equal to y is different from 4 ..... x=y≠4
GMAT Club team member
User avatar
Joined: 02 Sep 2009
Posts: 11533
Followers: 1795

Kudos [?]: 9553 [0], given: 826

GMAT Tests User CAT Tests
Top Member of the Month
Re: is there a typo in this Q because it doesnt make any sense!! [#permalink] New post 10 Nov 2009, 07:20
elinka wrote:
it means .. x is equal to y is different from 4 ..... x=y≠4


If the correct answer is B (80) then there is a definitely a typo. The stem should state:

x=y+4 , x=20-y, x^2-y^2=?

Then the solution from lagomez is absolutely correct:
x=y+4 --> x-y=4
x=20-y --> x+y=20

x^2-y^2=(x-y)(x+y)=4*20=80.
_________________

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

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. NEW!!!

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. NEW!!!


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

Find out what's new at GMAT Club - latest features and updates

Intern
Intern
Joined: 09 Nov 2009
Posts: 20
Followers: 0

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

Re: is there a typo in this Q because it doesnt make any sense!! [#permalink] New post 10 Nov 2009, 07:28
thanks, I wasnt sure if there was a catch since the question, in its "correct" form, seems way too simple ...
Manager
Manager
User avatar
Joined: 23 Jun 2009
Posts: 156
Followers: 1

Kudos [?]: 6 [0], given: 9

GMAT Tests User
Re: is there a typo in this Q because it doesnt make any sense!! [#permalink] New post 12 Nov 2009, 02:15
Bunuel wrote:
elinka wrote:
it means .. x is equal to y is different from 4 ..... x=y≠4


If the correct answer is B (80) then there is a definitely a typo. The stem should state:

x=y+4 , x=20-y, x^2-y^2=?

Then the solution from lagomez is absolutely correct:
x=y+4 --> x-y=4
x=20-y --> x+y=20

x^2-y^2=(x-y)(x+y)=4*20=80.


Thanks Bunuel ..you r the best as always :-D
Re: is there a typo in this Q because it doesnt make any sense!!   [#permalink] 12 Nov 2009, 02:15
    Similar topics Author Replies Last post
Similar
Topics:
 New posts does this make sense? saurabh357 3 12 Sep 2007, 09:25
New posts 1 Plug in the answer question- doesnt make sense rayasif 1 17 Oct 2010, 08:28
New posts 1 GMAT percentile doesn't make sense? jubinell 4 25 Mar 2011, 21:22
New posts EXPERTS_POSTS_IN_THIS_TOPIC Does my potential strategy make any sense? dynastyss 2 19 Oct 2012, 08:04
New posts Kaplan gmat test score does not make any sense gmatstudentsf 0 09 Dec 2012, 22:45
Display posts from previous: Sort by

is there a typo in this Q because it doesnt make any sense!!

  Question banks Downloads My Bookmarks Reviews  
Print view
First unread post

Moderators: Bunuel, VeritasPrepKarishma, IanStewart

Search for:


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®.

Main navigation

GMAT Resources

Partners

MBA Resources

www.gmac.com|www.mba.com