If the difference between the average of x, y and y, z is 12, then the difference between x and z is :

A. 6 B. 48 C. 24 D. 12 Answer: Option C

Solution(By Apex Team)

\begin{aligned}&\text{According to the question,}\\ &\frac{x+y}{2}-\frac{y+z}{2}=12\\ &\Rightarrow\ x+y-y-z=24\\ &\Rightarrow\ x-z=24\end{aligned}

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