If M ÷ N means M is the father of N, M + N means M is the daughter of N, and M - N means M is the son of N, what is the relationship of O if M ÷ N - O?

B. O IS M'S SON

If M + N means M is the uncle of N, N - O means N is the sister of O, and O × P means O is the father of P, what is the relationship of P to M?

A. P IS THE NEPHEW OF M

D is the father of E. E is married to F. What is F's relation to D?

B. DAUGHTER-IN-LAW

A is the brother of B. C is the sister of A. How is C related to B?

A. SISTER

If A + B means A is the sister of B, A - B means A is the brother of B, and A × B means A is the mother of B, what is the relationship of C if A + B × C?

A. C IS A'S DAUGHTER