The school library buys 100 books, takes out 28 books and puts them on the bookshelf, and distributes the rest to 4 classes on average. How many books will each class get?
校图书馆买来100本书，拿出28本书放在书架上，剩下的平均分给4个班，每班分得多少本书？
<gadget id="calculator">100 - 28</gadget>
<output>72</output>

<gadget id="calculator">72 / 4</gadget>
<output>18</output>

<result>18</result>