Aunt Wang’s family has a rectangular vegetable garden with a length of 28 meters and a width of 12 meters. If Aunt Wang wants to build a fence around the vegetable garden, how many meters of fence does she need at least?
王大妈家有一块长方形的菜园，长是28米，宽是12米，王大妈要在这个菜园的四周围上篱笆，至少需要多少米的篱笆？
<gadget id="calculator">28 + 12</gadget>
<output>40</output>

<gadget id="calculator">40 * 2</gadget>
<output>80</output>

<result>80</result>