A total of 6.4 tons of cabbage is harvested in a parallelogram vegetable field with a base length of 40 meters and a height of 20 meters. How many kilograms of cabbage are harvested on average per square meter?
在一块底长为40米，高为20米的平行四边形菜地里共收白菜6.4吨，平均每平方米收白菜多少千克？
<gadget id="calculator">40 * 20</gadget>
<output>800</output>

<gadget id="calculator">1_000 / 800</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">6.4 * (5/4)</gadget>
<output>8</output>

<result>8</result>