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If x and y are intergers, I am sure that they can be 0

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Manager
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Joined: 03 Jan 2008
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If x and y are intergers, I am sure that they can be 0 [#permalink] New post 02 Apr 2008, 18:00
If x and y are intergers, I am sure that they can be 0 (because 0 is an interger).
However I dont understand why this one has D as OA??
Does GMAT define that Intergers do not include 0 ?

If the average (arithmetic mean) of positive integers x, y, and z is 10, what is the greatest possible value of z ?
A. 8
B. 10
C. 20
D. 28
E. 30
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Director
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Joined: 10 Sep 2007
Posts: 950
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Re: Intergers!! [#permalink] New post 02 Apr 2008, 19:52
Question says "positive integers". 0 is neither positive nor negative. So cannot be considered here. So x=y=1 are the least possible value for x and y.

1 + 1 + z/3 = 10
=> 2+z = 30
=> z = 28

Answer D.
Manager
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Joined: 03 Jan 2008
Posts: 109
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Kudos [?]: 7 [0], given: 0

Re: Intergers!! [#permalink] New post 03 Apr 2008, 06:55
abhijit_sen wrote:
Question says "positive integers". 0 is neither positive nor negative.


Tks. That's what I need 8-)
Re: Intergers!!   [#permalink] 03 Apr 2008, 06:55
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If x and y are intergers, I am sure that they can be 0

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