The average weight of 15 students in a class increases by 1.5kg when one of the

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Question

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

Options:

A . 56 kg.

B . 64.5 kg.

C . 62.5 kg.

D . 60 kg.

Answer: Option C
Answer: (c)Weight of the new student = (40 + 15 × 1.5) kg = (40 + 22.5) kg = 62.5 kg Aliter : Using Rule 18, If in the group of N persons, a new person comes at the place of a person of 'T’ years, so that average age, increases by 't’ years Then, the age of the new person = T + N.t. Here, N = 15, T = 40, t = 1.5 Weight of new Person = T + Nt = 40 + 15 × 1.5 = 40 + 22.5 = 62.5 kg.

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