In a family of six members A, B, C, D, E, and F, A is the father of B. C is the mother of B and D. E is the sister of A. F is the son of C. How is D related to F?
Seven friends, W, X, Y, Z, A, B, and C, attended a party. W arrived before X but after Y. Z arrived before A and after B. C arrived last. What is the order of arrival?
A family consists of a mother, a father, and three children: P, Q, and R. P is the eldest and is studying medicine. Q is studying engineering and is younger than P but older than R. What is R's field of study?