There are 3 classes in grades 4, 5, and 6. If 108 students go to the nursing home to clean, how many students should each class choose on average?
四、五、六年级各有3个班，要是108名同学去敬老院打扫卫生，平均每班要选多少名同学？
<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<gadget id="calculator">108 / 9</gadget>
<output>12</output>

<result>12</result>