There is a rectangular vegetable field, 6 meters wide and twice as long as it is wide. What is the area of this vegetable field?
有一块长方形的菜地，宽6米，长是宽的2倍．这块菜地的面积是多少？
<gadget id="calculator">6 * 2 * 6</gadget>
<output>72</output>

<result>72</result>