Four friends, A, B, C, and D, are sitting in a row. A is not at either end. B is sitting next to C. D is at one of the ends. Who is sitting in the middle?
Five books are arranged on a shelf: P, Q, R, S, and T. R is to the left of Q but to the right of P. S is to the right of T. Which book is at the extreme right?
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. D is the sister of B. E is the brother of B. F is the grandmother of B. How is D related to F?
Five friends, P, Q, R, S, and T, are compared based on their heights. P is taller than Q but shorter than R. S is shorter than T but taller than Q. Who is the tallest among them?