The length of a vegetable field is 20 meters and the width is 15 meters. What is the area of this vegetable field in square meters?
一块菜地的长是20米，宽是15米，这块菜地的面积是多少平方米？
<gadget id="calculator">20 * 15</gadget>
<output>300</output>

<result>300</result>