A rectangular playground is 45 meters long and 10 meters less wide than its length. What is the perimeter of the playground in meters?
一个长方形操场，长45米，宽比长少10米，这个操场的周长是多少米？
<gadget id="calculator">45 - 10</gadget>
<output>35</output>

<gadget id="calculator">45 + 35</gadget>
<output>80</output>

<gadget id="calculator">80 * 2</gadget>
<output>160</output>

<result>160</result>