In the activity of collecting tree species for greening the motherland, there are 2 classes in the fifth grade of a certain school, each class collects 20 kilograms of tree species, and 3 classes in the sixth grade collect a total of 70 kg, how many kilograms of tree species are collected on average in each class?
在绿化祖国采集树种的活动中，某校五年级2个班级，每班采集树种20千克，六年级3个班共采集70千克，平均每班采集树种多少千克？
<gadget id="calculator">20 * 2</gadget>
<output>40</output>

<gadget id="calculator">70 * 3</gadget>
<output>210</output>

<gadget id="calculator">40 + 210</gadget>
<output>250</output>

<gadget id="calculator">2 + 3</gadget>
<output>5</output>

<gadget id="calculator">250 / 5</gadget>
<output>50</output>

<result>50</result>