If D is the mother of E and F is the father of E, what is F to D?

C. HUSBAND

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

A. C IS THE SISTER OF B

X is the mother of Y. Y has a brother Z. What is Z's relation to X?

A. SON

If K is the grandmother of L, and L is the daughter of M, what is the relationship of K to M?

A. MOTHER

If M is the grandmother of N and O is the mother of N, what is O's relationship to M?

A. DAUGHTER