A rectangular playground is 80 meters long and 60 meters wide. If you run around the playground, how many meters will you run?
一个长方形操场，长80米，宽60米，围着操场跑了一圈，跑了多少米？
<gadget id="calculator">80 + 60</gadget>
<output>140</output>

<gadget id="calculator">140 * 2</gadget>
<output>280</output>

<result>280</result>