Source: Mathematical Circles-Dmitri Fomin
Problem:
The son of professor’s father is talking to the father of professor’s son
and the professor does not takes part in the conversation. How
The son of professor’s father is talking to the father of professor’s son
and the professor does not takes part in the conversation. How
Professor = Lady
ReplyDeleteProfessor’s father = Lady’s father
Son of professor’s father = Lady’s brother
Father of professor’s son = Lady’s husband
So, this lady's brother is talking to Lady's husband (or his brother-in-law).