### The average of two numbers is XY. If one number is X, the other is.

A. $\large\frac{Y}{2}$ B. Y C. 2XY – X D. X (Y – 1) Answer: Option C

### Solution(By Apex Team)

$\begin{array}{l}\text{Sum of numbers = 2XY}\\ \text{∴ Other number = 2XY – X}\end{array}$

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