Five books are arranged on a shelf: Book A is to the left of Book B, Book C is to the right of Book A, and Book D is to the left of Book E. What is the possible order of the books?
Answer: B. D, A, C, B, E
Book A must be to the left of Book B and C must be to the right of A. D must be to the left of E, making D, A, C, B, E a valid arrangement.