There is a trapezoidal vegetable field with an upper base of 24m, a lower base of 36m and a height of 20m. A total of 2,100 kilograms of cabbage was harvested in this field. How many kilograms of cabbage were harvested on average per square meter?
有一块梯形菜地，上底24m，下底36m，高20m．在这块田里共收白菜2100千克，平均每平方米收白菜多少千克？
<gadget id="calculator">24 + 36</gadget>
<output>60</output>

<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<gadget id="calculator">60 * 10</gadget>
<output>600</output>

<gadget id="calculator">2_100 / 600</gadget>
<output>7/2 = around 3.5</output>

<result>7/2 = around 3.5</result>