Five books are arranged on a shelf. Book A is to the left of Book B but to the right of Book C. Book D is to the right of Book E but to the left of Book B. What is the sequence of the books from left to right?
Answer: D. E, C, A, D, B
C must be first, A is to the right of C, D is to the left of B and to the right of E, leading to the order E, C, A, D, B.