rectangular vegetable field is 18 meters long. If the length is increased to 22 meters and the width is reduced by 3 meters, the area remains the same. What is the original area of the rectangular vegetable field in square meters?
一个长方形菜地长18米，如果把它的长增加到22米，宽减少3米，面积的大小正好不变，这块长方形菜地原来的面积是多少平方米？
<gadget id="calculator">22 * 3</gadget>
<output>66</output>

<gadget id="calculator">22 - 18</gadget>
<output>4</output>

<gadget id="calculator">66 / 4</gadget>
<output>33/2 = around 16.5</output>

<gadget id="calculator">18 * (33/2)</gadget>
<output>297</output>

<result>297</result>