Question

There are 60 boys in a class. One boy weighing 50 kg goes away and at the same time another boy joins the classes. The average weight of the boys is then increased by 1/4 kg. What is the weight (in kg) of the new boy

Answer 1

Answer:

65 kg

Step-by-step explanation:

Let,

the total weight of the class be x kg

the weight of the new boy be y kg

After the 50kg boy leaves and the new boy joins,

Total weight of the class becomes

(x + y - 50) kg

According to the question,

$\frac{(x + y - 50)}{60} = \frac{x}{60} + \frac{1}{4}$

=> x + y - 50 = x + 15

or, y = 50+15 = 65 kg

Therefore, the weight of the new boy is 65 kg.