A piece of land is rectangular, its width is 18 meters, and its length is 6 meters less. What is the area of this piece of land in square meters?
一块地是长方形，宽是18米，比长少6米，这块地的面积是多少平方米？
<gadget id="calculator">18 + 6</gadget>
<output>24</output>

<gadget id="calculator">18 * 24</gadget>
<output>432</output>

<result>432</result>