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

It is currently 20 Aug 2014, 06:52

Starting Soon:

Live Q&A Session with Cambridge Admissions Team   ||    Join Chat Room to Attend the Session


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

What is the average weight of the three new team members who

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
2 KUDOS received
Manager
Manager
avatar
Joined: 04 Feb 2011
Posts: 64
Location: US
Followers: 2

Kudos [?]: 8 [2] , given: 42

What is the average weight of the three new team members who [#permalink] New post 20 Feb 2011, 22:00
2
This post received
KUDOS
1
This post was
BOOKMARKED
00:00
A
B
C
D
E

Difficulty:

  35% (medium)

Question Stats:

56% (01:53) correct 44% (01:25) wrong based on 39 sessions
What is the average weight of the three new team members who were recently included in the team?

1. The average weight of the team increases by 20 kg
2. The three new men substitute the earlier members whose weights were 64 kg, 75 kg and 66 kg.

The source: http://www.testpreppractice.net
[Reveal] Spoiler: OA

Last edited by Bunuel on 21 Feb 2011, 05:31, edited 1 time in total.
Edited the OA
Kaplan Promo CodeKnewton GMAT Discount CodesVeritas Prep GMAT Discount Codes
Manager
Manager
avatar
Joined: 14 Feb 2011
Posts: 198
Followers: 4

Kudos [?]: 59 [0], given: 3

GMAT Tests User
Re: data suff average [#permalink] New post 20 Feb 2011, 22:54
Let w be original average weight of the team having N members and A be the average weight of the the three new members.

From 1, (w*N+3*A)/(N+3) = w + 20 We cant solve for A till we know N and w, so insufficient

From 2, we just have information about the weight out of the system (205 Kg) and no information on w or N, so cant solve for A, insufficient.

Combining 1 and 2 , we get (w*N-205+3*A)/(N) = w+20 Again, we cant solve for A till we know w and N so insufficient again

Answer E
SVP
SVP
avatar
Joined: 16 Nov 2010
Posts: 1692
Location: United States (IN)
Concentration: Strategy, Technology
Followers: 30

Kudos [?]: 285 [0], given: 36

GMAT Tests User Premium Member Reviews Badge
Re: data suff average [#permalink] New post 21 Feb 2011, 03:50
Hi

The answer seems to be E. Are you sure it's D ?

Let x be mean of weights and n be the number of people.

=> x*n - Total Weight

From (1) we have :
x + 20 is new mean

(x + 20) (n + 3) - New total weight

[(x+20) (n + 3) - xn]/3

is average weight of 3 people

Not sufficient.

From (2) we have :
x*n - 205 + 3*w = 20*n

Not sufficient.

Even (1) and (2) are not enough, so E.

Could someone please opine on whether I'm correct ?

Regards,
Subhash
_________________

Formula of Life -> Achievement/Potential = k * Happiness (where k is a constant)

Get the best GMAT Prep Resources with GMAT Club Premium Membership

Re: data suff average   [#permalink] 21 Feb 2011, 03:50
    Similar topics Author Replies Last post
Similar
Topics:
1 Experts publish their posts in the topic Three boxes have an average weight of 7kg and a median weigh kwhitejr 12 22 Aug 2010, 20:19
Another problem: What is the weight of one of three puma 2 23 Mar 2008, 07:32
Three boxes of supplies have an average weight of 7 kgs and varunk 7 28 Sep 2007, 10:18
Three teams, A, B and C each have five members. The three coldweather999 4 22 Sep 2007, 18:35
Experts publish their posts in the topic Three boxes have an average weight of 7 kg and a median getzgetzu 12 26 Apr 2006, 01:28
Display posts from previous: Sort by

What is the average weight of the three new team members who

  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®.