Uncle Zhang plans to enclose a rectangular vegetable field with a length of 10 meters and a width of 6 meters. If there is a fence around the vegetable field, what is the total length of the fence?
张大爷打算围一块长10米、宽6米的长方形菜地．如果菜地的四周都要围上篱笆，篱笆全长多少米？
<gadget id="calculator">10 + 6</gadget>
<output>16</output>

<gadget id="calculator">16 * 2</gadget>
<output>32</output>

<result>32</result>