### The average weight of 20 students in a class is increased by 0.75 kg when one student of 35 kg replaced by a new student. Weight of the new student (in kg) is :

A. 35 B. 40 C. 45 D. 50 Answer: Option D

### Solution(By Apex Team)

Let the weight of the new student = x kg According to the question, $\begin{array}{l}\left(\Large\frac{x-35}{20}\right)=0.75\\ \Rightarrow x-35=15\\ \Rightarrow x=50\end{array}$

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