Plant cucumbers in a square vegetable plot with a side length of 4 meters and harvest 320 kilograms in total. How many kilograms of cucumbers are harvested on average per square meter?
在一个边长4米的正方形菜地中种黄瓜，共收320千克，平均每平方米收黄瓜多少千克？
<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<gadget id="calculator">320 / 16</gadget>
<output>20</output>

<result>20</result>