### The average monthly income of A and B is Rs. 14000, that of B and C is Rs. 15600 and A and C is Rs. 14400. The monthly income of C is :

A. Rs. 16000 B. Rs. 15000 C. Rs. 14000 D. Rs. 15500 Answer: Option A

### Solution(By Apex Team)

$\begin{array}{l}\text{Income of A and B}\\ \text{= 2 × 14000}\\ \text{= Rs. 28000}\\ \text{Income of B and C}\\ \text{= 2 × 15600}\\ \text{= Rs. 31200}\\ \text{Income of A and C}\\ \text{= 2 × 14400}\\ \text{= Rs. 28800}\\ \text{Income of A, B and C}\\ =\Large\frac{(28000+31200+28800)}{2}\\ =\text{ Rs. }44000\\ \text{C’s income}\\ \text{= 44000 – 28000}\\ \text{= Rs. 16000}\end{array}$

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