A rectangular flower bed is 9 meters long and 6 meters wide. Xiao Ming walked around the flower bed. How many meters did he walk?
一个长方形花坛，长9米，宽6米，小明围着这个花坛走一圈，他走了多少米？
<gadget id="calculator">9 + 6</gadget>
<output>15</output>

<gadget id="calculator">15 * 2</gadget>
<output>30</output>

<result>30</result>