The perimeter of a rectangle is 38dm**2, the width is 9dm, what is the area?
一个长方形的周长是38dm**2，宽是9dm，面积是多少．
<gadget id="calculator">38 / 2</gadget>
<output>19</output>

<gadget id="calculator">19 - 9</gadget>
<output>10</output>

<gadget id="calculator">10 * 9</gadget>
<output>90</output>

<result>90</result>