A red flag is 20 cm long and 12 cm wide. What is the perimeter of the red flag?
一面红旗长20厘米，宽12厘米，这面红旗的周长是多少．
<gadget id="calculator">20 + 12</gadget>
<output>32</output>

<gadget id="calculator">32 * 2</gadget>
<output>64</output>

<result>64</result>