Question

There were 40 girls in the class Smita, which weighs 50 kilos, leaves the class, a new girl rasmi comes and raises the average weight of the class to 1/4 kg. Get Rashmi's Weight

Answer 1

Rashmi was of 60kgs........

Answer 2

The weight of Rashmi is 60 kg.

Explanation:

Consider the provided information.

Let the weight of Rashmi be x.

It is given that the total number of students is 40.

Smitha who weights 50 Kgs, Leaves the class. A new girl Rashmi comes and increases the average weight by the class.

Use the Mean formula: $mean=\frac{\text{Sum of observation}}{\text{Total number of observations}}$

Let the initial average of the class is y.

$y=\frac{\text{Sum of observation}}{40}$

$40 y=\text{Sum of observation}$

A new girl rasmi comes and raises the average weight of the class to 1/4 kg.

$y+\frac{1}{4}=\frac{40y-50+x}{40}\\40y+10=40y-50+x\\x=60$

Hence, the weight of Rashmi is 60 kg.

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