There are 50 students in a class. One of them weighing 50

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There are 50 students in a class. One of them weighing 50 kg goes away and a new student joins. By this the average weight of the class increases by 1/2 kg. The weight of the new student is :

1. 70 kg
2. 72 kg
3. 75 kg
4. 76 kg

Correct Option: C

Total weight increased =	1	× 50 = 25 kg
	2

∴ Weight of the new man = Weight of the man + Total weight increased
Weight of the new man = 50 + 25 = 75 kg.
Second method to solve this question with the help of given formula :

Here, N = 50, T = 50, t =	1
	2

Weight of New boy = T + Nt

Weight of New boy = 50 + 50 ×	1	= 75 kg
	2