conversations.from: human
conversations.value: This math problem has got me stumped: Elly is organizing her books on the new bookcases her parents bought her. Each of the middle 2 shelves can hold 10 books. The bottom shelf can hold twice as many books as a middle shelf. The top shelf can hold 5 fewer books than the bottom shelf. If she has 110 books, how many bookcases does she need to hold all of them?
  Can you show me the way?
conversations.from: assistant
conversations.value: The bottom shelf can hold 2 * 10 = 20 books.
  The 2 middle shelves can hold a total of 2 * 10 = 20 books.
  The top shelf can hold 20 – 5 = 15 books.
  Each bookcase can hold a total of 20 books + 20 books + 15 books = 55 books.
  To hold all of her books, she needs 110 / 55 = 2 bookcases.