There are 18 classes in Xingfu Primary School, with an average of 45 students in each class. In order to support the disaster area, the students donated a total of 4,050 books. How many books do each person donate on average?
幸福小学有18个班，平均每班45人，为了支援灾区，同学们共捐献图书4050本，平均每人捐献图书多少本？
<gadget id="calculator">45 * 18</gadget>
<output>810</output>

<gadget id="calculator">4_050 / 810</gadget>
<output>5</output>

<result>5</result>