In a coded relation, if P × Q means P is the mother of Q, P ÷ Q means P is the father of Q, and P + Q means P is the son of Q, what is the relationship of R if P × R ÷ Q?
In a coded relationship, if M + N means M is the sister of N, M - N means M is the brother of N, and M × N means M is the mother of N, what is the relationship of O if M + O × N?
If X - Y means X is the sister of Y, X + Y means X is the brother of Y, and X ÷ Y means X is the mother of Y, what is the relationship of Z if X ÷ Z - Y = true?