SOLUTION: on independence day in a group of children each child gives one gift to other if there are only 90 gifts how many students are there in a group

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Question 848457: on independence day in a group of children each child gives one gift to other if there are only 90 gifts how many students are there in a group
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

how many students +highlight_green%28n%29are there in a group 

n(n-1) = 90    (each in the group giving remaining group members a gift)

 n^2 - n - 90 = 0

(n-10)(n+9) = 0   (Tossing out the negative solution for unit measure)  

  n = 10 in the group