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

It is currently 03 May 2015, 17:52

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

Exams

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Director
Director
avatar
Status: Finally Done. Admitted in Kellogg for 2015 intake
Joined: 25 Jun 2011
Posts: 563
Location: United Kingdom
Concentration: International Business, Strategy
GMAT 1: 730 Q49 V40
GPA: 2.9
WE: Information Technology (Consulting)
Followers: 21

Kudos [?]: 994 [0], given: 217

Exams [#permalink] New post 18 Nov 2011, 13:02
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

50% (01:03) correct 50% (01:39) wrong based on 6 sessions
The average score of x number of exams is y. When an additional exam of score z is added in, does the average score of the exams increase by 50%?
(1) 3x = y
(2) 2z - 3y = xy

For me its E. Can someone please confirm?
_________________

Best Regards,
E.

MGMAT 1 --> 530
MGMAT 2--> 640
MGMAT 3 ---> 610
GMAT ==> 730

2 KUDOS received
Current Student
avatar
Joined: 08 Jan 2009
Posts: 330
GMAT 1: 770 Q50 V46
Followers: 23

Kudos [?]: 105 [2] , given: 7

Re: Exams [#permalink] New post 19 Nov 2011, 04:40
2
This post received
KUDOS
Restate the question as variables:

is (xy + z)/(x+1) = 1.5y?
xy + z = 1.5xy + 1.5y
.5xy = z - 1.5y
xy = 2z - 3y



1) No idea what number z is - NS
2) 2z - 3y = xy - Sufficient as per restatment

B

Another way to think of this is to try some numbers. Clearly A is insufficient we need to know something about z, but with 2), you could try something like the following:

assume x = 1, y = 1, by 2) z must = 2
average before: 1, average after: 3 / 2 = 1.5. Exactly 50% increase.

assume x = 2, y = 4, by 2) z = 10
average before: 8 / 2 = 4, average after 18 / 3 = 6. Exactly 50% increase.

Seems safe to go with B.
Re: Exams   [#permalink] 19 Nov 2011, 04:40
    Similar topics Author Replies Last post
Similar
Topics:
exam Amardeep Sharma 2 06 Dec 2007, 05:34
Princeton Exam nitostyle 1 06 Jul 2007, 01:07
Profficiency exams Dilshod 17 01 Apr 2007, 13:02
Order of Exam? TheRedRoost3r 7 25 Feb 2007, 20:42
Practice Exams donnieray3 0 12 Jun 2005, 15:59
Display posts from previous: Sort by

Exams

  Question banks Downloads My Bookmarks Reviews Important topics  


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®.