A rectangular playground is 120 meters long and 40 meters longer than its width. What is the perimeter of the playground in meters?
一个长方形操场，长120米，比宽长40米，这个操场的周长是多少米？
<gadget id="calculator">120 - 40</gadget>
<output>80</output>

<gadget id="calculator">120 + 80</gadget>
<output>200</output>

<gadget id="calculator">200 * 2</gadget>
<output>400</output>

<result>400</result>