rectangular playground is 150 meters long and 40 meters wide. If you run 2 laps around the playground, how many meters will you run?
一个长方形操场，长是150米，宽40米，围着这个操场跑2圈，要跑多少米？
<gadget id="calculator">150 + 40</gadget>
<output>190</output>

<gadget id="calculator">190 * 2 * 2</gadget>
<output>760</output>

<result>760</result>