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Question:

The average of 9 numbers is 'x' and the average of three of these is 'y'. If the average of the remaining numbers is 'z', then

A3x +2z=y

B3x - y = 2z

C3x +2y +z=0

DX = 2z+3y.

Answer:

B. 3x - y = 2z

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