Question

The average weight of a group of NN children is (N+1)(N

Q: Answer-The average weight of a group of NN children is (N+1)(N + 1) kg. When a child weighing 36.5 kg leave...

Sum of the weights of N children N X N 1 N2 N kg ATQ, N2 N - 36.5 N - 1 N 1 - 0.5 Or, N2 N - 36.5 N - 1 X N 0.5 Or, N2 N - 36.5 N2 0.5N - N - 0.5 Or, 15N 360 So, N 24 Therefore, initial number of children in the group N 24

+ 1) kg. When a child weighing 36.5 kg leaves the group, the average weight decreases by 0.5 kg. Determine the original number of children in the group.

A 22

B 24

C 26

D 25

E 23