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
Answer : Option B
Explanation : Sum of 6 numbers = 6x
Sum of 3 numbers = 3y
Sum of remaining 3 numbers = 3z
∴ 6x = 3y + 3z
⇒ 2x = y + z
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