There are 200 story books in the school library. There are 3 classes in the fourth grade, and each class borrows 25 books. The rest are lent to 5 classes in the fifth grade, how many books are borrowed by each class on average?
学校图书室一共有200本故事书，四年级3个班，每班借了25本．剩下的借给五年级的5个班，平均每班借多少本？
<gadget id="calculator">3 * 25</gadget>
<output>75</output>

<gadget id="calculator">200 - 75</gadget>
<output>125</output>

<gadget id="calculator">125 / 5</gadget>
<output>25</output>

<result>25</result>