What is the area of a rectangle with a length of 20 decimeters and a width of 5 decimeters
一个长方形长20分米，宽5分米，它的面积是多少
<gadget id="calculator">20 * 5</gadget>
<output>100</output>

<gadget id="calculator">100 / 100</gadget>
<output>1</output>

<result>1</result>