A + B means A is the father of B ;
A - B means A is the wife of B ;
A x B means A is the brother of B ;
A ÷ B means A is the daughter of B.
Rahul told Anand, 'Yesterday I defeated the only brother of the daughter of my grandmother.'
Whom did Rahul defeat ?
Arun said, "This girl is the wife of the grandson of my mother."
Who is Arun to the girl ?