The perimeter of a rectangle is 36 cm, the length is 12 cm, what is the width in cm?
一个长方形的周长是36厘米，长为12厘米，宽是多少厘米？
<gadget id="calculator">36 / 2</gadget>
<output>18</output>

<gadget id="calculator">18 - 12</gadget>
<output>6</output>

<result>6</result>