The perimeter of a square is 40 decimeters, what is the side length in meters?
一个正方形的周长是40分米，边长是多少米．
<gadget id="calculator">40 / 4</gadget>
<output>10</output>

<gadget id="calculator">10 / 10</gadget>
<output>1</output>

<result>1</result>