A + B means A is the son 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 mother of B; and A = B means A is the sister of B. What does P + R - Q mean ?
Answer: A. Q is the father of P.
Clearly, P + R - Q means, P is the son of R who is the wife of Q i.e. Q is the father of P. Hence, the answer is (a).