In a coded relation, if M + N means M is the daughter of N, M - N means M is the son of N, and M × N means M is the grandmother of N, what is the relationship of O if M + O - N?

D. O IS M'S DAUGHTER

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

If M is the father of N and N is the son of O, what is the relationship of O to M?

D. MOTHER

If P - Q means P is the sister of Q, and Q + R means Q is the brother of R, what is the relationship between P and R?

A. SISTER

In a coded relation, if A ÷ B means A is the daughter of B, B + C means B is the father of C, and C - D means C is the brother of D, what is the relationship of D to A?

B. D IS THE SISTER OF A