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

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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:

5% (low)

Question Stats:

88% (01:42) correct 12% (00:46) wrong based on 253 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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