A rectangular square is 100 meters long and 30 meters wide. How many meters does it take to walk around the square?
一个长方形广场，长是100米，宽是30米，绕这个广场一周走了多少米？
<gadget id="calculator">100 + 30</gadget>
<output>130</output>

<gadget id="calculator">130 * 2</gadget>
<output>260</output>

<result>260</result>