There are 741 books in the 3 classes of the fourth grade, and 848 books in the 4 classes of the fifth grade. How many books are there on average in each class?
四年级3个班有741本书，五年级4个班有848本书，平均每个班图书相差几本？
<gadget id="calculator">741 / 3</gadget>
<output>247</output>

<gadget id="calculator">848 / 4</gadget>
<output>212</output>

<gadget id="calculator">247 - 212</gadget>
<output>35</output>

<result>35</result>