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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 ?
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- 64.5 kg.
- 56 kg.
- 60 kg.
- 62.5 kg.
- 64.5 kg.
Correct Option: D
According to question ,
Weight of the new student = (40 + 15 × 1.5) kg
Weight of the new student = (40 + 22.5) kg = 62.5 kg
Second method to solve this question with the help of given formula :
Here, N = 15, T = 40, t = 1.5
Weight of new Person = T + Nt
Weight of new Person = 40 + 15 × 1.5
Weight of new Person = 40 + 22.5 = 62.5 kg.
