If the length of a rectangle is 27 meters and the width is 6 meters shorter than the length, what is its area in square meters?
一个长方形的长是27米，宽比长短6米，那它的面积是多少平方米
<gadget id="calculator">27 - 6</gadget>
<output>21</output>

<gadget id="calculator">27 * 21</gadget>
<output>567</output>

<result>567</result>