Xiaodong walked around the rectangular garden with a length of 70 meters and a width of 20 meters. How many meters did Xiaodong walk?
小东沿着长70米、宽20米的长方形花园走了一圈，小东走了多少米
<gadget id="calculator">70 + 20</gadget>
<output>90</output>

<gadget id="calculator">90 * 2</gadget>
<output>180</output>

<result>180</result>