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 Choose the correct choice from the following answers
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 numbers is X and the average of three of these is Y.If the average of the remaining three is Z, then