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The average (arithmetic mean) of 7, 9, and x is greater than

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sandy
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The average (arithmetic mean) of 7, 9, and x is greater than [#permalink] New post   09 May 2015, 11:08
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The average (arithmetic mean) of 7, 9, and x is greater than 9.


Quantity A
Quantity B
x
11


A)The quantity in Column A is greater.
B)The quantity in Column B is greater.
C)The two quantities are equal.
D)The relationship cannot be determined from the information given.

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Re: GRE Math Challenge #90-The average (arithmetic mean) of 7, 9 [#permalink] New post   17 Jan 2018, 00:02
A is greater. I plug 11 in x, the average is 9
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Re: GRE Math Challenge #90-The average (arithmetic mean) of 7, 9 [#permalink] New post   26 Jan 2018, 10:32
(7+9+X)/3 > 9
(16+X) > 27
X>11
Answer: A
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Re: The average (arithmetic mean) of 7, 9, and x is greater than [#permalink] New post   11 Dec 2019, 09:58
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Re: The average (arithmetic mean) of 7, 9, and x is greater than [#permalink] New post   11 Feb 2021, 00:40
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I missed this one just because the inequality. "Silly one :)"
Here we are asked to find value of x, given that (7+9+x)/3>9. the average of the three numbers are >9.
Ok multiply each side by 3 ==> 16+x>27 ==> x>11.
To have an average> 9, x must have a value greater than 11.
Answer is (A)
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