conversations.from: human
conversations.value: Can you give me some step-by-step instructions for this math problem: A school library has 120 books.  Each student needs 5 books for their classes.  The library was able to help 4 students on the first day of school, 5 students on the second day and 6 students on the third day.  How many students can the library help out on the fourth day of school?
conversations.from: assistant
conversations.value: On the first day, the library used 4 students * 5 books = 20 books.
  On the second day, the library used 5 students * 5 books = 25 books.
  On the third day, the library used 6 students * 5 books = 30 books.
  On the fourth day, the library had 120 books - 20 - 25 - 30 = 45 books remaining.
  The library can help 45 books / 5 books = 9 students on the fourth day.