Q: A person says that his son is 5 times as old as his daughter and his wife is 5 times older than his son and he is twice the age of his wife . The sum total of all the ages equals the age of the grand mother who celebrated her 81st birthday today. How old was his son?

• A. 50 yrs
• B. 25 yrs
• C. 72 yrs
• D. 40 yrs