There is a batch of books, which are distributed to 6 classes, 8 classes, and 9 classes on average, and there are only 2 books left. How many books are there in this batch?
有一批图书，平均分给6个班、8个班、9个班都剩2本，这个批图书至少有多少本？
<gadget id="calculator">2 * 2 * 2 * 3 * 3</gadget>
<output>72</output>

<gadget id="calculator">72 + 2</gadget>
<output>74</output>

<result>74</result>