Two-fifths of the 10 books are reading books, so there are 10 * 2/5 = 4 reading books.
Three-tenths of the 10 books are math books, so there are 10 * 3/10 = 3 math books.
There is one less science book than math books, so there are 3 - 1 = 2 science books.
The total number of reading, math, and science books is 4 + 3 + 2 = 9 books.
Since there are initially 10 books on the table, the remaining book must be a history book.
Therefore, there is 1 history book.
#### 1
The answer is: 1
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
If there are initially 10 books on the table, with two-fifths of them being reading books and three-tenths of them being math books, and there is one less science book than math books, how many history books are there?

### Answer:
