There are 12 classes in the fourth grade of the Second Experimental Primary School, and each class has 8 groups. A total of 864 books were donated to the disaster area. How many books do each group donate on average?
第二实验小学四年级有12个班，每班有8个小组，共为灾区捐图书864本，平均每个小组捐多少本？
<gadget id="calculator">12 * 8</gadget>
<output>96</output>

<gadget id="calculator">864 / 96</gadget>
<output>9</output>

<result>9</result>