A rectangular fish pond is 20 meters long and 9 meters wide. Dudu Xiong walked around the fish pond twice, how many meters did it walk in total?
一个长方形的鱼池，长是20米，宽是9米，嘟嘟熊沿着鱼池四周走了2圈，它共走了多少米？
<gadget id="calculator">20 + 9</gadget>
<output>29</output>

<gadget id="calculator">29 * 2 * 2</gadget>
<output>116</output>

<result>116</result>