A bed is 9 meters long and 20 decimeters wide, what is its area?
一张床长9米，宽20分米，它的面积是多少？
<gadget id="calculator">20 / 10</gadget>
<output>2</output>

<gadget id="calculator">9 * 2</gadget>
<output>18</output>

<result>18</result>