The area of a rectangular vegetable field is 450 square meters, and its width is 9 meters. If a fence is to be built around the land, how long will the fence be?
一块长方形菜地的面积是450平方米，它的宽是9米．如果要在这块地的四周围上篱笆，篱笆长多少米？
<gadget id="calculator">450 / 9</gadget>
<output>50</output>

<gadget id="calculator">50 + 9</gadget>
<output>59</output>

<gadget id="calculator">59 * 2</gadget>
<output>118</output>

<result>118</result>