A + B means A is the father of B ;
A - B means A is the wife of B ;
A x B means A is the brother of B ;
A ÷ B means A is the daughter of B.

If P - R + Q, which of the following statements is true ?

Answer: A. P is the mother of Q
P - R + Q means P is the wife of R who is the father of Q i.e. P is the mother of Q.