Hi,

how many students are 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 

 

RELATED QUESTIONS

In a group of children, each child gives one gift to the other.If total gifts are 90,... (answered by ewatrrr)

In a group of children, each child gives one gift to other. If total numbers of gift are... (answered by josgarithmetic)

In how many ways can 9 gifts be divided between 4 children if the eldest child is to... (answered by ikleyn)

In their kindergarten classroom, a child is pouring and layering different colors of sand  (answered by Edwin McCravy)

A group of 6 children are choosing colored pencils to draw a picture. Each child is... (answered by greenestamps)

mrs.A class wants to but her a gift, the gifts is cost $90 and there are 30 student in... (answered by jorel1380)

A group of children share some dougnuts.if each child gets 4 pieces, there will be 2... (answered by josmiceli)

Q.1 How many ways can 4 teddy bears , 3 toy trucks , 5 dolls and 1 toy cars be... (answered by stanbon)

Hello, I just need someone to check my answers for these questions. Thank You.

1. In... (answered by ikleyn)