conversations.from: human
conversations.value: Provide a step by step solution for the following math problem: There are 10 books on the table. Two-fifths of them are reading books and three-tenths of them are math books. There is one fewer science book than math books and the rest are history books. How many history books are there?
conversations.from: assistant
conversations.value: Out of the 10 books, 10 x 2/5 = 4 are reading books.
  While 10 x 3/10 = 3 are math books.
  There are 3 - 1 = 2 science books.
  So, the total number of reading, math, and science books is 4 + 3 + 2 = 9.
  Thus, there is only 10 - 9 = 1 history book.