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

It is currently 15 Sep 2014, 01:53

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

DS problem from GMAT club

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Intern
Intern
avatar
Joined: 03 Aug 2009
Posts: 3
Followers: 0

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

DS problem from GMAT club [#permalink] New post 14 Aug 2009, 13:58
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

50% (02:31) correct 50% (01:14) wrong based on 1 sessions
another DS problem from gmat club: answer seems to be wrong

A certain prime x is divided by 5 to result in a fraction. Then the fraction's numerator is increased by 4 and its denominator is doubled, after which the resulting fraction is reduced. If the denominator of the result is odd, what is x?

. 7
. 5
. 4
. 3
. 2

------------------------
GMAT club answer: 2
-------------------------

but 2 wouldn't meet the criteria shown in the problem. 2/5 = .4 but 6/10 = .6; .6> .4 ("after which resulting fraction is reduced")
This is the 2nd math problem I got where GMAT club answer was not correct. anybody else having the same issue?
Thanks
Kaplan Promo CodeKnewton GMAT Discount CodesVeritas Prep GMAT Discount Codes
Manager
Manager
avatar
Joined: 25 Jul 2009
Posts: 117
Schools: NYU, NUS, ISB, DUKE, ROSS, DARDEN
Followers: 4

Kudos [?]: 143 [0], given: 17

GMAT Tests User
Re: DS problem from GMAT club [#permalink] New post 14 Aug 2009, 14:19
santoshsingh wrote:
another DS problem from gmat club: answer seems to be wrong

A certain prime x is divided by 5 to result in a fraction. Then the fraction's numerator is increased by 4 and its denominator is doubled, after which the resulting fraction is reduced. If the denominator of the result is odd, what is x?

. 7
. 5
. 4
. 3
. 2

------------------------
GMAT club answer: 2
-------------------------

but 2 wouldn't meet the criteria shown in the problem. 2/5 = .4 but 6/10 = .6; .6> .4 ("after which resulting fraction is reduced")
This is the 2nd math problem I got where GMAT club answer was not correct. anybody else having the same issue?
Thanks


GMAT Club answer is correct.

By reducing the question means canceling out of common factor, which in this case is 2.
_________________

KUDOS me if I deserve it !! :)

My GMAT Debrief - 740 (Q50, V39) | My Test-Taking Strategies for GMAT | Sameer's SC Notes

SVP
SVP
User avatar
Joined: 05 Jul 2006
Posts: 1542
Followers: 5

Kudos [?]: 75 [0], given: 39

Re: DS problem from GMAT club [#permalink] New post 14 Aug 2009, 14:57
[quote="santoshsingh"]another DS problem from gmat club: answer seems to be wrong

A certain prime x is divided by 5 to result in a fraction. Then the fraction's numerator is increased by 4 and its denominator is doubled, after which the resulting fraction is reduced. If the denominator of the result is odd, what is x?

. 7
. 5
. 4
. 3
. 2

x/5.....x+4/10 for that to be reduced and denom gives odd x has to be devisable by 2 the only even prime is 2 itself thus x is 2
Manager
Manager
avatar
Joined: 12 Aug 2009
Posts: 107
Followers: 3

Kudos [?]: 12 [0], given: 2

Reviews Badge
Re: DS problem from GMAT club [#permalink] New post 14 Aug 2009, 18:18
In real test, I would have pick up - 2

Just curious why 7 is not the answer 7/5 -> 1 - 2/5 leading to same results as picking up 2.
Or does the fraction implies the has to be less than 1?
Manager
Manager
avatar
Joined: 25 Jul 2009
Posts: 117
Schools: NYU, NUS, ISB, DUKE, ROSS, DARDEN
Followers: 4

Kudos [?]: 143 [0], given: 17

GMAT Tests User
Re: DS problem from GMAT club [#permalink] New post 14 Aug 2009, 23:55
dolly12 wrote:
In real test, I would have pick up - 2

Just curious why 7 is not the answer 7/5 -> 1 - 2/5 leading to same results as picking up 2.
Or does the fraction implies the has to be less than 1?


If you take 7, then (7+4)/10 is not reducible as there is no common factor. And no, the fraction need not be less than 1, but the only prime number that satisfies this condition is 2 as its the only even prime no.
_________________

KUDOS me if I deserve it !! :)

My GMAT Debrief - 740 (Q50, V39) | My Test-Taking Strategies for GMAT | Sameer's SC Notes

Director
Director
User avatar
Joined: 01 Apr 2008
Posts: 909
Schools: IIM Lucknow (IPMX) - Class of 2014
Followers: 15

Kudos [?]: 214 [0], given: 18

GMAT Tests User
Re: DS problem from GMAT club [#permalink] New post 15 Aug 2009, 12:34
Only 2 and 4 shall satisfy the given condition. But we need to be sure that x is prime, so we pick 2 as the answer.
Expert Post
Founder
Founder
User avatar
Affiliations: UA-1K, SPG-G, HH-D
Joined: 04 Dec 2002
Posts: 12174
Location: United States (WA)
GMAT 1: 750 Q49 V42
GPA: 3.5
WE: Information Technology (Hospitality and Tourism)
Followers: 2267

Kudos [?]: 8737 [0], given: 3666

GMAT ToolKit User Premium Member CAT Tests
Re: DS problem from GMAT club [#permalink] New post 15 Aug 2009, 15:16
Expert's post
You can find discussions of many gmatclub tests questions here: gmat-club-tests-master-threads-all-tests-78599.html
_________________

Founder of GMAT Club

Just starting out with GMAT? Start here... | Want to know your GMAT Score? Try GMAT Score Estimator
Need GMAT Book Recommendations? Best GMAT Books

Co-author of the GMAT Club tests

Have a blog? Feature it on GMAT Club!

Get the best GMAT Prep Resources with GMAT Club Premium Membership

Re: DS problem from GMAT club   [#permalink] 15 Aug 2009, 15:16
    Similar topics Author Replies Last post
Similar
Topics:
Experts publish their posts in the topic From MitDavidDv: Problems taking the Free GMAT Club Tests MitDavidDv 1 16 Apr 2011, 19:37
1 DS from GMAT Club Test - Need Help ! nesta 9 22 Dec 2009, 15:31
Geometry DS (from club challenges) foodstamp 2 19 Sep 2008, 14:34
GMAT Prep - DS problem maheshkrishna 3 20 Jun 2008, 09:01
I brought the Math problem collection from GMAT CLUB and one rahul 2 18 Sep 2004, 06:43
Display posts from previous: Sort by

DS problem from GMAT club

  Question banks Downloads My Bookmarks Reviews Important topics  


cron

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®.