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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 :

A) x = y + z

B) 2x = y + z

C) x = 2y + 2z

D) None of these

Option B

Clearly we have $x=\frac{3y+3z}{6} =>2x=y+z$

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