There is a rectangular flower bed. Its circumference is 36 decimeters and its length is 10 decimeters. What is its width?
有一个长方形的花坛，它的周长是36分米，长是10分米，它的宽是多少？
<gadget id="calculator">36 / 2</gadget>
<output>18</output>

<gadget id="calculator">18 - 10</gadget>
<output>8</output>

<result>8</result>