Question

The average weight of 5 children is 50 kg.
If one boy joined their group, they gained an average of 5 kg,
So how much does that child weigh?

Answer 1

Answer:

is it 80kgs?

Step-by-step explanation:

because,

average weight of 5 children= 50kg

and hence the total actual weight would be 50*5=250kgs

and next,

let the weight of the boy be 'x' kgs then,

(250+x)/6=55kgs

Answer 2

Answer:

The weight of the new child is 80 kgs.

Step-by-step explanation:

Given:

Average weight of 5 children= 50 kgs.
Total weight of the 5 children= 5×50= 250 kgs.

Now, a new child joins them, due to which the average weight increases by 5kgs, which gives us:

New average of 6 children= 55 kgs
Total weight of 6 children= 6×55= 330 kgs.

∴ Weight of the new child= 330-250= 80 kgs.

∴ The new child weighs 80 kgs.