The side length of a square flower bed is 20 decimeters, what is its perimeter in meters
一个正方形花坛的边长是20分米，它的周长是多少米
<gadget id="calculator">20 * 4</gadget>
<output>80</output>

<gadget id="calculator">80 / 10</gadget>
<output>8</output>

<result>8</result>