If the average of 5 numbers is 10, the number which should be added to make the average 12 is-

A. 12 B. 18 C. 22 D. 24 Answer: Option C

Solution(By Apex Team)

$\begin{array}{l}\text{Required number}\\ \text{= (12 × 6) – (10 × 5)}\\ \text{= 72 – 50}\\ \text{= 22}\end{array}$

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