### 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-

A. x = y + z B. 2x = y + z C. x = 2y + 2z D. None of these Answer: Option B

### Solution(By Apex Team)

$\begin{array}{l}\text{ Clearly, we have : }\\ \Rightarrow x=\left(\large\frac{3y+3z}{6}\right)\\ \Rightarrow2x=y+z\end{array}$

A. 20
B. 21
C. 28
D. 32

A. 18
B. 20
C. 24
D. 30

A. 10 years
B. 10.5 years
C. 11 years
D. 12 years