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If the average (arithmetic mean) of two numbers is 30 and on

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Director
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If the average (arithmetic mean) of two numbers is 30 and on [#permalink] New post 27 Feb 2018, 02:16
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If the average (arithmetic mean) of two numbers is 30 and one of the numbers is x, what is the other number in terms of x?

A)60 - x
B)60 - 2x
C)30 - x
D)(30 - x)⁄2
E)x - 60
[Reveal] Spoiler: OA
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Re: If the average (arithmetic mean) of two numbers is 30 and on [#permalink] New post 27 Feb 2018, 06:04
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If the arithmetic average of two numbers is 30 then we can set up the equation as

(x + y)/2 = 30
(x + y) = 60
-x -x
y = 60 - x

Answer A
Re: If the average (arithmetic mean) of two numbers is 30 and on   [#permalink] 27 Feb 2018, 06:04
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If the average (arithmetic mean) of two numbers is 30 and on

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