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  Options:	A) x = y + z	B) 2x = y + z	C) 3x = 2y - 2z	D) 3x = 9y - 2z	E) 3x = 2y - 1z
Explanation:   Clearly, we have : x = (3y + 3z ) / 6 or 2x = y + z   Answer: 2x = y + z
<result>B</result>
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