Grandpa Wang walked twice along the rectangular flower bed that is 40 meters long and 30 meters wide. How many meters did he walk?
王爷爷沿长40米、宽30米的长方形花坛走了两圈，他走了多少米？
<gadget id="calculator">40 + 30</gadget>
<output>70</output>

<gadget id="calculator">70 * 2 * 2</gadget>
<output>280</output>

<result>280</result>