The length of a rectangle is 11 cm and the width is 5 cm less than the length, what is its perimeter in cm?
一个长方形长11厘米，宽比长少5厘米，它的周长是多少厘米．
<gadget id="calculator">11 - 5</gadget>
<output>6</output>

<gadget id="calculator">11 + 6</gadget>
<output>17</output>

<gadget id="calculator">17 * 2</gadget>
<output>34</output>

<result>34</result>