Xiaohua walks around the playground that is 80 meters long and 40 meters wide, how many meters did he walk
小华沿着长80米，宽40米的操场走一圈，他走了多少米
<gadget id="calculator">40 + 80</gadget>
<output>120</output>

<gadget id="calculator">120 * 2</gadget>
<output>240</output>

<result>240</result>