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If the average (arithmetic mean) of positive integers x, y,

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If the average (arithmetic mean) of positive integers x, y, [#permalink] New post 08 Oct 2008, 12:31
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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Re: math--intergers [#permalink] New post 08 Oct 2008, 12:38
albany09 wrote:
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


z is max when x,y are min ( as long as they are +ve not 0 ) thus they can be only 1,1

nothing is mentioned about being different intigers

thus z can max = 8
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Re: math--intergers [#permalink] New post 08 Oct 2008, 12:44
how come ??

mean of 8 and 1,1 cannot be 10

has to be 28
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Re: math--intergers [#permalink] New post 08 Oct 2008, 13:10
yezz wrote:
albany09 wrote:
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


z is max when x,y are min ( as long as they are +ve not 0 ) thus they can be only 1,1

nothing is mentioned about being different intigers


My bad...:) thanks guys

z = 30-2 = 28
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Re: math--intergers [#permalink] New post 08 Oct 2008, 17:42
D

same reason as given by others.
Re: math--intergers   [#permalink] 08 Oct 2008, 17:42
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If the average (arithmetic mean) of positive integers x, y,

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