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 :
Options:
A . 72 kg
B . 70 kg
C . 76 kg
D . 75 kg
Answer: Option D Answer: (d)Total weight increased =$1/2$ × 50 = 25 kg. ∴ Weight of the new man = 50 + 25 = 75 kg. Aliter : Using Rule 18,The age of the new person = T + N.t.Here, N = 50, T = 50, t = $1/2$ Weight of New boy = T + Nt = 50 + 50 × $1/2$ = 75 kg.
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