### The average weight of 15 students in a class increases by 1.5 kg when one of the students weighing 40 kg is replaced by a new student. What is the weight (in kg) of the new student ?

A. 64.5 kg B. 56 kg C. 60 kg D. 62.5 kg Answer: Option D

### Solution(By Apex Team)

Let the weight of 1 student = x kg The weight to 15 student = 15x kg Let the weight of new comer = y kg $\begin{array}{l}\text{∴ According to the question,}\\ \text{ 15x – 40 + y = 15 (x + 1.5)}\\ \text{⇒ 15x – 40 + y = 15x + 22.5}\\ \text{⇒ y = 62.5 kg}\end{array}$

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