Question 201731: my father and father-in-law turned in 60 and 64 this year in october. in what year was my father twice the age of my father-in-law ? Answer by solver91311(24713) (Show Source):
The way you stated the question, the answer is never. If your father is younger than your father-in-law, then your father could never be twice as old as your father-in-law. On the other hand, 56 years ago, your father-in-law was 8 and your father was 4, so your father-in-law was twice your father's age at that time.