A parallelogram vegetable field has a base of 20 meters and a height of 15 meters. This year, a total of 2160 kilograms of vegetables will be harvested. How many kilograms of vegetables will be harvested on average per square meter?
一块平行四边形菜地，底是20米，高是15米，今年一共收2160千克蔬菜，平均每平方米收多少千克蔬菜？
<gadget id="calculator">20 * 15</gadget>
<output>300</output>

<gadget id="calculator">2_160 / 300</gadget>
<output>36/5 = around 7.2</output>

<result>36/5 = around 7.2</result>