The students of Xinhua Primary School plan to plant 270 trees, which will be distributed to each class of 6 grades on average. There are 5 classes in each grade. How many trees are planted in a class on average?
新华小学的同学计划植树270棵，平均分给6个年级的每个班，每个年级有5个班，一个班平均植树多少棵？
<gadget id="calculator">45 / 5</gadget>
<output>9</output>

<result>9</result>