Which girl is going to marry which man if the following facts are true:

Question

Bill, John, and Fred are going to marry Betty, Joan, and Sally. Tell which girl is going to marry which man if the following facts are true:
1. Bill is a lawyer.
2. Betty is not engaged to the engineer.
3. The doctor's future wife is not Joan.
4. John is engaged to Sally.
5. Fred is the engineer.

Answer 1

John is engaged to Sally,
Fred is engineer and Betty is not engaged to an engineer .. So Betty is engaged to Bill
The remaining two --> Fred and Joan are engaged.
so , the pairs are this
Bill --> Betty
John--> Sally
Fred--> Joan

Answer 2

Bill-Betty
John-sally
Fred-joan

Answer 3

1. John and Sally
2. Bill and Betty
3. Fred and Joan

Answer 4

John is engaged to Sally.
Fred is the engineer and Betty is not engaged to the engineer so it is clear that fred is engaged to joan.
only Bill and Betty are left so those two are engaged.

JOHN ===> SALLY
FRED ===> JOAN
BILL ===> BETTY