A square handkerchief is 40 cm long. Lace is embroidered around it. How many decimeters is the length of the lace?
一块正方形手帕长40厘米，给它的周围绣上花边，花边长是多少分米？
<gadget id="calculator">40 * 4</gadget>
<output>160</output>

<gadget id="calculator">160 / 10</gadget>
<output>16</output>

<result>16</result>