A rectangular vegetable field is 24 meters long and three times its width. A fence should be built around it. How long is the fence?
一块长方形菜地，长24米，是宽的3倍，要在四周围上篱笆，篱笆长多少米？
<gadget id="calculator">24 / 3</gadget>
<output>8</output>

<gadget id="calculator">24 + 8</gadget>
<output>32</output>

<gadget id="calculator">32 * 2</gadget>
<output>64</output>

<result>64</result>