Are all of the numbers in a certain list of 15 numbers : GMAT Data Sufficiency (DS)
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Are all of the numbers in a certain list of 15 numbers

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Are all of the numbers in a certain list of 15 numbers [#permalink]

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31 Jul 2011, 03:10
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45% (medium)

Question Stats:

50% (01:31) correct 50% (00:35) wrong based on 12 sessions

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Are all of the numbers in a certain list of 15 numbers equal?

(1) The sum of all of the numbers in the list is 60
(2) The sum of any 3 numbers in the list is 12
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Re: DS problem pls help me to explain the problem~ Thank u~(3) [#permalink]

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31 Jul 2011, 05:28
Discussed here:

http://gmatclub.com/forum/equal-number-ds-find-the-shortcut-81028.html
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Re: DS problem pls help me to explain the problem~ Thank u~(3) [#permalink]

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31 Jul 2011, 06:00
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Kaustubh

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Re: DS problem pls help me to explain the problem~ Thank u~(3) [#permalink]

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01 Aug 2011, 19:35
For B, any three number's sum is 12. So what if 2,5,5, the sum is 12 but they are not equal.

Could you explain this ????

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Re: DS problem pls help me to explain the problem~ Thank u~(3) [#permalink]

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01 Aug 2011, 19:35
For B, any three number's sum is 12. So what if 2,5,5, the sum is 12 but they are not equal.

Could you explain this ????

mehtakaustubh wrote:
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Re: DS problem pls help me to explain the problem~ Thank u~(3) [#permalink]

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02 Aug 2011, 09:52
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They all must be equal. The key word here is ANY.
You have 15 numbers. If you pick 2,5,5, what other numbers you have? If you have another five, then you could get 3 numbers this way: 5,5,5 and that won't be 12. So, if the sum of ANY 3 numbers is 12, then there are only fours in the list.
Re: DS problem pls help me to explain the problem~ Thank u~(3)   [#permalink] 02 Aug 2011, 09:52
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