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# If the average (arithmetic mean) of two numbers is 35 and o

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If the average (arithmetic mean) of two numbers is 35 and o [#permalink]  19 Jun 2017, 12:01
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If the average (arithmetic mean) of two numbers is 35 and one of the numbers is k, then what is the other number in terms of k ?

A) 35 + k

B) 35 – k

C) 35 – 2k

D) 70 – k

E) 70 – 2k
[Reveal] Spoiler: OA

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Re: If the average (arithmetic mean) of two numbers is 35 and o [#permalink]  20 Sep 2017, 05:14
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The average between k and an unknown number x is frac{k+x}{2}=35. Thus rearranging is straightforward to find that x=70-k. Answer D!
Re: If the average (arithmetic mean) of two numbers is 35 and o   [#permalink] 20 Sep 2017, 05:14
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