One of four people - two men (Ben and Carl) and two women (Dorothy and Evelyn) - was murdered.

The following facts relate to the people mentioned:

(a) Ben's sister argued exactly once with Dorothy's legal husband after the murder.

(b) Carl's sister argued twice with the victim's legal spouse after the murder.

Who was the victim?

Ben's sister is either Dorothy or Evelyn. Suppose Ben's sister is Dorothy. Then, Dorothy's husband is Carl. Then, Carl's sister is Evelyn. Since Dorothy, Carl, and Evelyn argued, Ben is the victim. However, Ben's wife has to be Evelyn, so Carl's sister is the victim's spouse. That means that Evelyn argued with herself. That is weird, so Ben's sister is Evelyn. Therefore, Carl's sister is Dorothy and Dorothy's husband is Ben. Also, Carl's wife is Evelyn. Since Evelyn, Ben, and Dorothy all argued, the victim is Carl.

Posted by Math Man on 2012-04-11 15:31:34