The school library bought 552 new comic books, lent 300 to the fifth grade, and lent the remaining 9 classes to the fourth grade. How many books are allocated to each class on average?
学校图书室新买552本漫画书，借给五年级300本，剩下借给四年级的9个班，平均每个班分多少本？
<gadget id="calculator">552 - 300</gadget>
<output>252</output>

<gadget id="calculator">252 / 9</gadget>
<output>28</output>

<result>28</result>