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The average of six numbers is x and the average of three of these is y. If the average of the remaining three is z, then :

x = y + z
2x = y + z
3x = 2y - 2z
none of these

Correct Answer: 2x = y + z

Explanation:

Clearly, we have : x = (3y + 3z ) / 6 or 2x = y + z.

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