SOLUTION: If the average (arithmetic mean) of x and y is k, which of the following is the average of x, y, and z?

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Question 92637: If the average (arithmetic mean) of x and y is k, which of the following is the average of x, y, and z?
Answer by checkley75(3666) About Me  (Show Source):
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AVE. OF X&Y=K (K+Z)/3. ANSWER.