What strategy do I use?

Question

1. Carrie, Rita and Sandra are married to Allan, Fred and John, but (a) Sandra does not like John, (b) Rita is married to John's Brother, and (c) Allan is married to Rita's sister. Who is married to whom? 

Strategy used? _______________________________________

Answer 1

Logical Reasoning. It is not a math calculation question.

Carrie, Rita, Sandra are going to be matched as a couple with Allan, or Fred, or John.

1) Sandra ≠ John

2) Rita ≠ John (She is with John's bro)

3) Rita ≠ Allan (Allan is married to Rita's sister)

Therefore:

a) Rita is married to Fred (Rita is not married to either John or Allan).

Now only Carrie, Sarndra and Allan, John left.

b) Sandra is married to Allan (because Sandra does not like John)

c) Carrie is married to John.