In the coded relation A ÷ B means A is the son of B, B + C means B is the sister of C, and C - D means C is the mother of D. What is the relationship of A to D in the expression A ÷ B + C - D?
Answer: D. A is the nephew of D
A is the son of B, B is the sister of C, and C is the mother of D, making A the nephew of D.