The length of a rectangle is 17 cm and the width is 6 cm shorter than the length. What is the perimeter of the rectangle?
一个长方形长17厘米，宽比长短6厘米，这个长方形的周长是多少．
<gadget id="calculator">17 - 6</gadget>
<output>11</output>

<gadget id="calculator">17 + 11</gadget>
<output>28</output>

<gadget id="calculator">28 * 2</gadget>
<output>56</output>

<result>56</result>