Pointing to the lady on the platform, Manju said, "She is the sister of the father of my mother's son."
Who is the lady to Manju ?
Pointing to a man on the stage, Rita said, "He is the brother of the daughter of the wife of my husband."
How is the man on the stage related to Rita ?
A + B means A is the daughter of B ;
A - B means A is the husband of B ;
A x B means A is the brother of B.