A rectangular playground is 25 meters long and 18 meters wide. What is the perimeter of the playground?
一个长方形运动场，长25米，宽18米，这个运动场的周长是多少米？
<gadget id="calculator">25 + 18</gadget>
<output>43</output>

<gadget id="calculator">43 * 2</gadget>
<output>86</output>

<result>86</result>