Register    Login    Search    Rss Feeds

Forums Home » Ask An Instructor » GMAT Math » General Math Questions


 Page 1 of 1 [ 6 posts ] 



  Print view Print view Previous topic Previous topic | Next topic Next topic
 

Avg data suff problem

Author Message
nipukumar
 Post subject: Avg data suff problem
 Post Posted: Mon Jan 31, 2011 4:06 am 
Offline
Course Students


Posts: 11
I am not sure if General Math is still open, but have seen recent posts and reply in the forum, hence i am posting my query. This is a data sufficiency problem.

Committee A and Committee B , which have no common members, will combine to form Committee C . Does Committee A have more members than Committee B ?

(1) The average (arithmetic mean) age of the members of Committee A is 25.7 years and the average age of the members of Committee B is 29.3 years.

(2) The average (arithmetic mean) age of the members of Committee C will be 26.6 years.

What is the approach here ?
Top 
jnelson0612
 Post subject: Re: Avg data suff problem
 Post Posted: Tue Feb 01, 2011 12:19 am 
Offline
ManhattanGMAT Staff


Posts: 1857
Hi nipukumar,
Will you please provide the source for this problem, as well as the given answer?

Thanks!

_________________
Jamie Nelson
ManhattanGMAT Instructor
Top 
nipukumar
 Post subject: Re: Avg data suff problem
 Post Posted: Tue Feb 01, 2011 4:30 am 
Offline
Course Students


Posts: 11
Hi Jamie,
This one appeared in paper-n-pencil test code 31.

Correct ans is: C (Together)

Thanks,
Top 
pranabiitkgp
 Post subject: Re: Avg data suff problem
 Post Posted: Tue Feb 01, 2011 9:26 am 
Offline
Forum Guests


Posts: 63
no of members in Committee A is a
and no of members in Committee B is b
(25.7a + 29.3b)/(a+b )= 26.6

you will get a/b and hence which one is greater .so the ans is C.
Top 
gangesh.dubey
 Post subject: Re: Avg data suff problem
 Post Posted: Tue Feb 01, 2011 2:31 pm 
Offline
Course Students


Posts: 1
The approach should be as below.

Assuming the number of members in both the commitees are same,then the average age of the commitee C would be (29.3 +25.7)/2 = 27.5
Now,taking both the statements together,as the average age of the combined commitee is 26.6 ,commitee A definitely has more members as 26.6< 27.5

Regards,
Gangesh
Top 
jnelson0612
 Post subject: Re: Avg data suff problem
 Post Posted: Sun Feb 06, 2011 4:50 pm 
Offline
ManhattanGMAT Staff


Posts: 1857
nipukumar wrote:
Hi Jamie,
This one appeared in paper-n-pencil test code 31.

Correct ans is: C (Together)

Thanks,


Hi, so to clarify, this an official GMAT paper and pencil test?

_________________
Jamie Nelson
ManhattanGMAT Instructor
Top 
Display posts from previous:  Sort by  
 
 Page 1 of 1 [ 6 posts ] 





Who is online

Users browsing this forum: No registered users and 0 guests

 
 

 
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to: