The width of a rectangular vegetable field is 20 meters, which is 5 meters less than the length. What is the perimeter of the vegetable field in meters?
一块长方形菜地的宽是20米，比长少5米，这块菜地的周长是多少米？
<gadget id="calculator">20 + 5 + 20</gadget>
<output>45</output>

<gadget id="calculator">45 * 2</gadget>
<output>90</output>

<result>90</result>