A class consists of four students: John, Lisa, Mark, and Nina. The following conditions are given: 1) John is older than Lisa but younger than Mark. 2) Nina is the youngest. 3) Lisa is not the oldest. Who is the oldest student in the class?
A group of animals consists of a lion, a tiger, a bear, and a wolf. The following conditions are given: The lion is heavier than the tiger but lighter than the bear. The wolf is lighter than the tiger. Which animal is the heaviest?
Five friends P, Q, R, S, and T are sitting in a row. R is sitting between Q and S. T is sitting at one of the ends. Who is sitting to the immediate left of R?
Four friends, A, B, C, and D, have different pets: a dog, a cat, a bird, and a fish. A does not own the dog or the cat. B owns the bird. C does not own the fish. Which pet does D own?