In the "Love Yushu, Great Love Without Boundaries" donation activity, the three classes of the fourth grade of Guangming Primary School donated a total of 2,400 yuan, with an average of 40 students in each class. How much is the average donation per person?
在"情系玉树，大爱无疆"捐款活动中，光明小学四年级3个班共捐款2400元，平均每班有学生40人，平均每人捐款多少元？
<gadget id="calculator">40 * 3</gadget>
<output>120</output>

<gadget id="calculator">2_400 / 120</gadget>
<output>20</output>

<result>20</result>