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

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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 \(10.\)

Answer: D

Source: GMAT Paper Tests