Question

The average weight of 11 children is 11 kg. The average weight of first five children is 9 kg, whereas the average weight of last five children is 13 kg. What is the weight of the sixth child

Answer 1

Answer:

Mariam: Let x be the average weight

First case: Sum of weights of people / 8 people = x

So the sum of weights of people = 8x

Second case: Sum of weights of people / 8 people = x + 2.5

So the sum of weights of people here is 8(x + 2.5) = 8x + 20

So the difference between both sums is essentially the new heavier person that was added which is:

8x + 20 - 8x = 20

So the new guy weights 20kg more than the old guy.

So new guy weights: 65 + 20 = 85kg

Riya said: (Nov 8, 2010)

Thank you. I was confused earlier. Your explanation has cleared it all. :).

Explanation:

PLEASE PLEASE PLEASE LIKE ME AND MARK ME AS BRANLIEST AND FOLLOW ME.