### The average weight of a class of 24 students is 35 kg. If the weight of the teacher be included, the average rises by 400 g. The weight of the teacher is –

A. 45 kg B. 50 kg C. 53 kg D. 55 kg Answer: Option A

### Solution(By Apex Team)

$\begin{array}{l}\text{Weight of the teacher}\\ \text{= (35.4 × 25 )- (35 × 24) kg}\\ \text{= 45 kg}\end{array}$

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