The area of a rectangular flowerbed is 576 square meters. It is known that the flowerbed is 48 meters long, and a fence should be built around the flowerbed. How long is the fence?
一个长方形花圃的面积是576平方米．已知花圃长48米，要在花圃四周围上篱笆，篱笆长多少米？
<gadget id="calculator">576 / 48</gadget>
<output>12</output>

<gadget id="calculator">48 + 12</gadget>
<output>60</output>

<gadget id="calculator">60 * 2</gadget>
<output>120</output>

<result>120</result>