The width of a rectangle is 5 cm, and the length is 3 cm longer than the width, what is the perimeter of the rectangle?
长方形的宽是5厘米，长比宽多3厘米，这个长方形的周长是多少．
<gadget id="calculator">5 + 3</gadget>
<output>8</output>

<gadget id="calculator">8 + 5</gadget>
<output>13</output>

<gadget id="calculator">13 * 2</gadget>
<output>26</output>

<result>26</result>