Pointing to a man, a woman said, "His mother is the only daughter of my mother."
How is the woman related to the man ?
Pointing to a lady, a man said, "The son of her only brother is the brother of my wife."
How is the lady related to the man ?
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.