rectangular garden has a length of 80 cm and a width of 60 cm, what is the circumference in cm?
一个长方形花园，它的长是80厘米，宽是60厘米，周长是多少厘米？
<gadget id="calculator">80 + 60</gadget>
<output>140</output>

<gadget id="calculator">140 * 2</gadget>
<output>280</output>

<result>280</result>