Experimental Primary School donated 960 books to the earthquake-stricken areas. There are 6 grades in the school, and each grade has 4 classes. How many books are donated by each class on average?
实验小学为地震灾区捐书960本，全校共有6个年级，每个年级有4个班，平均每个班捐书多少本？
<gadget id="calculator">960 / 6 / 4</gadget>
<output>40</output>

<result>40</result>