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

B. R IS Q'S DAUGHTER

P is the uncle of Q. Q is the daughter of R. How is R related to P?

C. SISTER-IN-LAW

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

B. HUSBAND AND WIFE

If X * Y means X is the mother of Y, and Y ÷ Z means Y is the daughter of Z, what is the relationship between X and Z?

A. GRANDMOTHER

If X + Y means X is the uncle of Y, X - Y means X is the aunt of Y, and X × Y means X is the brother of Y, what is the relationship of Z if X + Z - Y?

A. Z IS THE NIECE OF Y