A rectangle has a length of 10 cm and a perimeter of 36 cm, what is its width in cm?
一个长方形，它的长是10厘米，周长是36厘米，它的宽应是多少厘米？
<gadget id="calculator">36 / 2</gadget>
<output>18</output>

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

<result>8</result>