A rectangular flower bed is 6 meters long and 4 meters wide. Xiaojun walked around the flower bed twice, how many meters did he walk in total?
一个长方形花坛的长是6米，宽是4米．小军绕着这个花坛走了2圈，一共走了多少米？
<gadget id="calculator">6 + 4</gadget>
<output>10</output>

<gadget id="calculator">10 * 2 * 2</gadget>
<output>40</output>

<result>40</result>