Question

In a group of children each child gives a gift to every other, if the number of gifts is 132. Find then number of children?

A) 11
B) 12
C) 14
D) 16​

Answer 1

Answer:

B) 12

Step-by-step explanation:

Let the total number of children be x.

Considering a child, he/she gives the gift to total of (x−1) children.

Hence

x(x−1)=132

x(x−1)=12x11

Hence

x=12 and x−1=11

x=12

Hence 12 children in total.