SOLUTION: I have 5 more brothers than sisters, and each of my brothers also has five more brothers than sisters. If my family has 10 children how many of the children are girls?
From the condition, the number of boys in the family is 6 more than sisters.
So , one equation is
b + g = 10
The second equation is
b - g = 6.
Add the equations and find b = 8, g = 2.
Answer. There are 8 boys and 2 girls in the family.