A rectangular vegetable field is 16 meters long and 9 meters wide, surrounded by fences. If one side is against the wall, how many meters should the fence be at least?
一块长方形菜地，长16米，宽9米，周围要围上篱笆．如果一面靠墙，篱笆至少要多少米？
<gadget id="calculator">9 * 2</gadget>
<output>18</output>

<gadget id="calculator">16 + 18</gadget>
<output>34</output>

<result>34</result>