Five men in a small village have all married the widowed mother of one of the other five men.
Carter's stepson Adams is the stepfather of Brown. Carter's mother is a friend of Mrs Edwards, whose husband's mother is a friend of Mrs Brown.
What is the name of the stepson of Davies?
If the five men are designated A, B, C, D and E, and their mothers as a, b, c, d and e, then we have:
A married to b
B not married to e
C married to a
D not known
E not married to c
It follows that Edwards must be married to Davies' mother, Brown is married to Carter's mother and Davies is married to Edward's mother.
Thus Edwards is the stepson of Davies.