A swimming pool is 25 meters long and 15 meters wide, what is the perimeter of the swimming pool in meters?
游泳池长25米，宽15米，则游泳池的周长是多少米？
<gadget id="calculator">25 + 15</gadget>
<output>40</output>

<gadget id="calculator">40 * 2</gadget>
<output>80</output>

<result>80</result>