### If the arithmetic mean of seventy-five numbers us calculated, it is 35. If each number is increased by 5, then mean of new numbers is:

A. 30 B. 40 C. 70 D. 90 Answer: Option B

### Solution(By Apex Team)

Arithmetic mean of 75 members = 35 $\begin{array}{l}\text{Sum of 75 numbers}\\ \text{= (75 × 35) = 2625}\\ \text{Total increase}\\ \text{= (75 × 5) = 375}\\ \text{Increased sum}\\ \text{= (2625 + 375) = 3000}\\ \text{Increased average}\\ =\Large\frac{3000}{75}\\ =40\end{array}$

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