Family

Result

n =  10

Solution:

Leave us a comment of example and its solution (i.e. if it is still somewhat unclear...):

Trugamer
The reason I got this wrong is because it says "each of them had one brother", what's wrong with this is that I said six,it said it was five.

Math student
I think there 6 girls have 1 brother and 2 parents.

Math student
Each girl has one brother meaning that all 7 sisters share on brother.
Family includes father and the mother too so
7+1+2=10

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