If P ÷ Q means P is the sister of Q, and Q + R means Q is the mother of R, what is the relationship of P to R?

A. AUNT

A is the grandmother of B. C is the daughter of B. How is A related to C?

B. GRANDMOTHER

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 son of P, what is the relationship of M to P?

D. M IS THE BROTHER-IN-LAW OF P

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 = true?

A. C IS THE SISTER OF B

If J is the daughter of K, and K is the son of L, what is the relationship of L to J?

B. GRANDFATHER