The length of a rectangle is 20 cm, and it is 5 cm longer than the width, what is the perimeter of the rectangle in cm?
一个长方形的长是20厘米，它比宽多5厘米，这个长方形的周长是多少厘米．
<gadget id="calculator">20 - 5</gadget>
<output>15</output>

<gadget id="calculator">15 + 20</gadget>
<output>35</output>

<gadget id="calculator">35 * 2</gadget>
<output>70</output>

<result>70</result>