The perimeter of a square is 400 cm, what is the side length in decimeters?
正方形周长400厘米，边长是多少分米？
<gadget id="calculator">400 / 4</gadget>
<output>100</output>

<gadget id="calculator">100 / 10</gadget>
<output>10</output>

<result>10</result>