A rectangular piece of land is 18.5 meters long and 10.2 meters wide. One long side is against the wall, and the other three sides are surrounded by fences. How long is the fence?
一块长方形地长18.5米，宽10.2米，一长边靠墙，其余三边要围上篱笆，篱笆有多长？
<gadget id="calculator">10.2 * 2</gadget>
<output>20.4</output>

<gadget id="calculator">18.5 + 20.4</gadget>
<output>38.9</output>

<result>38.9</result>