A rectangular piece of colored paper is 6 cm long and 2 cm shorter than its width, what is its perimeter in cm?
一张长方形彩色纸长6厘米，宽比长短2厘米，它的周长是多少厘米．
<gadget id="calculator">6 - 2</gadget>
<output>4</output>

<gadget id="calculator">6 + 4</gadget>
<output>10</output>

<gadget id="calculator">10 * 2</gadget>
<output>20</output>

<result>20</result>