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If x is a positive number less than 10, is z greater than

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VP
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If x is a positive number less than 10, is z greater than [#permalink] New post 26 Dec 2007, 07:52
If x is a positive number less than 10, is z greater than the average (ar.mean) of x and 10?

1. on the number line, z is closer to 10 than it is to x
2. z=5x
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Director
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 [#permalink] New post 26 Dec 2007, 08:26
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1. The average of X and 10 is the midpoint between the two numbers. If Z is closer to 10 then to X it is larger than the average of X and 10.
SUFFICIENT

2. z=5x

for 1 x=5
(1+10)/2 = 5.5
x<5>6

INSUFFICIENT

Answer is A
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Re: number [#permalink] New post 22 Feb 2008, 06:49
nice explanation.

OA is A
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Re: number   [#permalink] 22 Feb 2008, 06:49
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