### The average salary, per head, of all the workers of an institution is Rs. 60. The average salary of 12 officers is Rs. 400; the average salary, per head, of the rest is Rs. 56. The total number of workers in the institution is.

A. 1030 B. 1035 C. 1032 D. 1020 Answer: Option C

### Solution(By Apex Team)

$\begin{array}{l}\text{Let the total number of worker = x}\\ \text{According to the question,}\\ \text{⇒ 12 × 400 + (x – 12) × 56 = 60x}\\ \text{⇒ 4800 + 56x – 672 = 60x}\\ \text{⇒ 4128 = 4x}\\ \Rightarrow x=\Large\frac{4128}{4}\\ \text{So,}\ x=1032\end{array}$

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