Uncle Zhang wants to fence a rectangular vegetable field with a length of 58 meters and a width of 26 meters. How long is the fence?
章叔叔要给一块长58米，宽26米的长方形菜地围篱笆，篱笆长多少米？
<gadget id="calculator">58 + 26</gadget>
<output>84</output>

<gadget id="calculator">84 * 2</gadget>
<output>168</output>

<result>168</result>