In the donation activity for the people in the disaster area, 20 classes of Siyuan Experimental School donated a total of 9,000 yuan. How much is the average donation per class?
在为灾区人民捐款活动中，思源实验学校有20个班共捐款9000元，平均每班捐款多少元？
<gadget id="calculator">9_000 / 20</gadget>
<output>450</output>

<result>450</result>