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# What is the average (arithmetic mean) of j and k ?

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Manager
Joined: 02 Dec 2012
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What is the average (arithmetic mean) of j and k ? [#permalink]  06 Dec 2012, 05:23
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Difficulty:

15% (low)

Question Stats:

85% (01:31) correct 14% (00:56) wrong based on 67 sessions
What is the average (arithmetic mean) of j and k ?

(1) The average (arithmetic mean) of j + 2 and k + 4 is 11.
(2) The average (arithmetic mean) of j, k, and 14 is 10.
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Re: What is the average (arithmetic mean) of j and k ? [#permalink]  06 Dec 2012, 05:26
Expert's post
What is the average (arithmetic mean) of j and k ?

We need to find the value of \frac{j+k}{2}.

(1) The average (arithmetic mean) of j + 2 and k + 4 is 11 --> \frac{(j+2)+(k+4)}{2}=11 --> j+k=16. Sufficient.
(2) The average (arithmetic mean) of j, k, and 14 is 10 --> \frac{j+k+14}{3}=10 --> j+k=16. Sufficient.

_________________
Re: What is the average (arithmetic mean) of j and k ?   [#permalink] 06 Dec 2012, 05:26
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