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DS - Number list

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AJ1440: Newbie | Next Rank: 10 Posts; Posts: 8; Joined: Tue Oct 04, 2011 4:39 pm

by AJ1440 » Wed Oct 12, 2011 7:14 pm

Hi

Are all of the numbers in a certain list of 15 numbers
equal?
(1) The sum of all the numbers in the list is 60.
(2) The sum of any 3 numbers in the list is 12.

Thanks!

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Source: Beat The GMAT — Data Sufficiency | Wed Oct 12, 2011 7:14 pm

shankar.ashwin: Legendary Member; Posts: 966; Joined: Sat Jan 02, 2010 8:06 amFollowed by: 21 members; Thanked: 230 times

by shankar.ashwin » Wed Oct 12, 2011 7:22 pm

(1) You could have any set of 15 numbers adding up to 60. Insuff
(2) Since any 3 numbers in the list add up to 12, the numbers should be equal and should all be =4. Suff.

B

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GMATGuruNY: GMAT Instructor; Posts: 15539; Joined: Tue May 25, 2010 12:04 pmFollowed by: 1906 members; Location: New York, NY; Thanked: 13060 times; GMAT Score:790

by GMATGuruNY » Thu Oct 13, 2011 3:29 am

I posted an explanation here:

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