There are some homework books, which are divided among 8 or 9 students according to the number of books, and each person gets the same amount, which is just finished. What is the minimum number of these workbooks?
有一些作业本，按本数分给8个或9个同学，每人分得同样多，正好分完．这些作业本最少有多少本？
<gadget id="calculator">8 * 9</gadget>
<output>72</output>

<result>72</result>