A square cabbage field with a side length of 20 meters, if 15.5 kilograms of cabbage can be harvested per square meter, how many kilograms of cabbage can be harvested in this field?
一块边长20米的正方形白菜地，如果每平方米收白菜15.5千克，这块地可收白菜多少千克？
<gadget id="calculator">20 * 20</gadget>
<output>400</output>

<gadget id="calculator">400 * 15.5</gadget>
<output>6_200</output>

<result>6_200</result>