There are 320 trees to be planted in the fifth and sixth grades. There are 3 classes in the fifth grade, and 30 trees are planted in each class. The rest are distributed to 5 classes in the sixth grade. How many trees are planted in each class on average?
五、六年级要栽树320棵，五年级有3个班，每班栽30棵，剩下的分给六年级5个班栽，平均每班栽多少棵？
<gadget id="calculator">30 * 3</gadget>
<output>90</output>

<gadget id="calculator">320 - 90</gadget>
<output>230</output>

<gadget id="calculator">230 / 5</gadget>
<output>46</output>

<result>46</result>