Answers

2016-03-05T14:10:10+05:30
Let there are n children, then each child will have n-1 gifts.
Total number of gift=total number of children*number of gifts per child
n(n-1)=132
if we solve we get  n=-11 and n=+12
n can not be negative. so,
n=12
therefore, no. of children is 12.
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2016-03-05T14:11:05+05:30
Let the total number of children be 'x'
So, the number of gifts each child will get = x-1 (He will not gift himself, that's why one less)
So, total number of gifts = x*(x-1)
Therefore,
x*(x-1)= 132
x²-x = 132
x²-x-132 = O
(x-12)(x+11)=0
So, x= 12, -11
Now, the number of children can't be negative.Therefore, number of children is 12.

Hope it helps !!!
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