Guangming Primary School shipped 720 saplings on Arbor Day. There are 6 grades in the school, and each grade has 3 classes. How many saplings are divided into each class on average?
光明小学在植树节这天运来720棵树苗，全校6个年级，每个年级3个班，平均每班分多少棵树苗？
<gadget id="calculator">720 / 6 / 3</gadget>
<output>40</output>

<result>40</result>