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

It is currently 19 May 2013, 22:40
Customize  |  Hide

Search
Register
New posts
Unanswered

Smart numbers

  Question banks Downloads My Bookmarks Reviews  
  Oldest Best Reply
Search for:
 
Print view
First unread post
Author Message
TAGS:
CEO
CEO
User avatar
Joined: 21 Jan 2007
Posts: 2797
Location: New York City
Followers: 5

Kudos [?]: 132 [0], given: 4

GMAT Tests User
Smart numbers [#permalink] New post 29 Oct 2007, 13:04
How can I solve this using smart numbers

Each of the N members of the club agreed to contribute X dollars to buy a new computer. IF the club contained 2 more members, HOW MUCH LESS would everyone have to contribute?

NX / (N+2)
X [(N+N) / (N+2)]
N / (XN + 2X)
X [(1-N) / (N+2)]
XN - [N/(N+2)]
CEO
CEO
User avatar
Joined: 29 Aug 2007
Posts: 2530
Followers: 41

Kudos [?]: 357 [0], given: 19

GMAT Tests User
Re: Smart numbers [#permalink] New post 29 Oct 2007, 15:07
bmwhype2 wrote:
How can I solve this using smart numbers

Each of the N members of the club agreed to contribute X dollars to buy a new computer. IF the club contained 2 more members, HOW MUCH LESS would everyone have to contribute?

NX / (N+2)
X [(N+N) / (N+2)]
N / (XN + 2X)
X [(1-N) / (N+2)]
XN - [N/(N+2)]


before:
number of people = n
each person's contribution = x
total contribution = nx

after:
number of people = n+2
each person's contribution = nx/(n+2)
total contribution = nx

so the difference = x - nx/(n+2) = x [1 - (n)/(n+2)]

so none of the above. D seems close if there is any typo.
CEO
CEO
User avatar
Joined: 21 Jan 2007
Posts: 2797
Location: New York City
Followers: 5

Kudos [?]: 132 [0], given: 4

GMAT Tests User
Re: Smart numbers [#permalink] New post 20 Dec 2007, 12:12
GMAT TIGER wrote:
bmwhype2 wrote:
How can I solve this using smart numbers

Each of the N members of the club agreed to contribute X dollars to buy a new computer. IF the club contained 2 more members, HOW MUCH LESS would everyone have to contribute?

NX / (N+2)
X [(N+N) / (N+2)]
N / (XN + 2X)
X [(1-N) / (N+2)]
XN - [N/(N+2)]


before:
number of people = n
each person's contribution = x
total contribution = nx

after:
number of people = n+2
each person's contribution = nx/(n+2)
total contribution = nx

so the difference = x - nx/(n+2) = x [1 - (n)/(n+2)]

so none of the above. D seems close if there is any typo.


sorry you are correct, it is x [1 - (n)/(n+2)]
i need to be more careful interpreting the algebra
Re: Smart numbers   [#permalink] 20 Dec 2007, 12:12
    Similar topics Author Replies Last post
Similar
Topics:
 New posts PR Grammar Smart vinay4MBA 0 31 Dec 2004, 09:14
New posts How smart? fawreel902 4 26 Dec 2007, 22:03
New posts I have issues with picking smart numbers for inequalities joyseychow 5 02 Apr 2009, 01:42
New posts 1 Using a Smart Number (Technique for PS) jagdeepsingh1983 0 01 Sep 2011, 05:50
New posts 4 Smart GMAT Zarrolou 2 12 May 2013, 08:31
Display posts from previous: Sort by

Smart numbers

  Question banks Downloads My Bookmarks Reviews  
Print view
First unread post

Moderators: Bunuel, VeritasPrepKarishma

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