Welcome! Check out our free B-School Guides to learn how you compare with other applicants.
Login or Register
 

list of numbers

This topic has 2 expert replies and 0 member replies
Bookmark
Previous Topic Next Topic
shrutib Rising GMAT Star Default Avatar
Joined
30 May 2012
Posted:
41 messages
Thanked:
3 times
list of numbers Post Wed May 30, 2012 9:19 pm
Elapsed Time: 00:00
  • Lap #[LAPCOUNT] ([LAPTIME])
    Are all the numbers of a certain list of 15 numbers are equal?

    1. The sum of all the numbers in the list is 60.

    2.The sum of any three number in the list is 12.

    P.S. I saw the OG explanation. Did not get it. Please explain

    Need free GMAT or MBA advice from an expert? Register for Beat The GMAT now and post your question in these forums!

    GMAT/MBA Expert

    Anurag@Gurome GMAT Instructor
    Joined
    02 Apr 2010
    Posted:
    3835 messages
    Followed by:
    466 members
    Thanked:
    1749 times
    GMAT Score:
    770
    Post Wed May 30, 2012 9:22 pm
    shrutib wrote:
    Are all the numbers of a certain list of 15 numbers are equal?

    1. The sum of all the numbers in the list is 60.

    2.The sum of any three number in the list is 12.

    P.S. I saw the OG explanation. Did not get it. Please explain
    Statement 1: The sum of all the numbers in the list is 60.
    We can have different set of 15 numbers such that their sum is 60; NOT sufficient.

    Statement 2: The sum of any 3 numbers in the list is 12.
    This is only possible when all the numbers in the set are equal. Consider the case when we have a single different number, say a and other are equal, say b. Now the selection of any three numbers may result (a, b, b) and (b, b, b). Now according to the question, (a + b + b) and (b + b + b) both must be equal to 12. Which is only possible when a = b = 4.

    This can shown for other combinations too. (Like 2 different, others equal etc); SUFFICIENT.

    The correct answer is B.

    _________________
    Anurag Mairal, Ph.D., MBA
    GMAT Expert, Admissions and Career Guidance
    Gurome, Inc.
    1-800-566-4043 (USA)

    Join Our Facebook Groups
    GMAT with Gurome
    https://www.facebook.com/groups/272466352793633/
    Admissions with Gurome
    https://www.facebook.com/groups/461459690536574/
    Career Advising with Gurome
    https://www.facebook.com/groups/360435787349781/

    Thanked by: shrutib

    GMAT/MBA Expert

    GMATGuruNY GMAT Instructor
    Joined
    25 May 2010
    Posted:
    6099 messages
    Followed by:
    1040 members
    Thanked:
    5273 times
    GMAT Score:
    790
    Most Active Expert Most Responsive Expert Most Thanked Expert
    Post Thu May 31, 2012 3:54 am

    _________________
    Mitch Hunt
    GMAT Private Tutor and Instructor
    GMATGuruNY@gmail.com
    If you find one of my posts helpful, please take a moment to click on the "Thank" icon.
    Contact me about long distance tutoring!

    Free GMAT Practice Test How can you improve your test score if you don't know your baseline score? Take a free online practice exam. Get started on achieving your dream score today! Sign up now.

    Best Conversation Starters
    1 varun289 38 topics
    2 killerdrummer 22 topics
    3 sana.noor 20 topics
    4 sanaa.rizwan 14 topics
    5 guerrero 14 topics
    See More Top Beat The GMAT Members...

    Most Active Experts
    1 image description Brent@GMATPrepNow

    GMAT Prep Now Teacher

    		 204 posts
    2 image description GMATGuruNY

    The Princeton Review Teacher

    		 136 posts
    3 image description Jim@StratusPrep

    Stratus Prep

    		 100 posts
    4 image description Anju@Gurome

    Gurome

    		 74 posts
    5 image description Jon@Admissionado

    Admissionado

    		 51 posts
    See More Top Beat The GMAT Experts