To welcome Teacher's Day, the students arranged a rectangular "painting display column" in the classroom. The length of the display column is 35 decimeters, and the width is 20 decimeters. What is the perimeter of this display column?
迎接教师节，同学们在教室里布置了一个长方形的"绘画展示栏"，展示栏的长是35分米，宽是20分米，这个展示栏的周长是多少分米？
<gadget id="calculator">35 + 20</gadget>
<output>55</output>

<gadget id="calculator">55 * 2</gadget>
<output>110</output>

<result>110</result>