The average of six number is x and the average of three of these is y. if the average of the remaining three is z, then : Choose one.
A) x = y+z	B) 2x = y+z	C) x = 2y+2z	D) None of these	E) Cannot be determined
Solution   Clearly, we have X=(3y+3z/6) or 2x= y + z. Answer 2x = y+z
<result>B</result>
The average of six number is x and the average of three of these is y. if the average of the remaining three is z, then :