Weiting Park has a concrete plaza with a length of 75 meters and a width of 35 meters. Now it is necessary to dig a drainage ditch around it. How long is this drainage ditch?
唯亭公园有一块长是75米，宽是35米的水泥地广场，现要在它的四周挖一条排水沟，这条排水沟一共有多长？
<gadget id="calculator">75 + 35</gadget>
<output>110</output>

<gadget id="calculator">110 * 2</gadget>
<output>220</output>

<result>220</result>