-
The average weight of 20 students in a class is increased by 0.75 kg when one of the students weighing 30 kg is replaced by a new student. Weight of the new student (in kg) is :
-
- 35
- 40
- 45
- 50
- 35
Correct Option: C
Here , Increase in weight = 0.75 kg
According to question ,
Required answer = 30 + 20 × 0.75
Required answer = 30 kg + 15 kg = 45 kg
Second method to solve this question with the help of given formula :
Here, N = 20, T= 30, t = 0.75
Weight of New student = T + Nt
Weight of New student = 30 + 20 × 0.75
Weight of New student = 30 + 15 = 45 kg
