A rectangular garden has an area of 18 square meters and a length of 6 meters. A fence is to be built around it. How long is the fence?
一块长方形花园的面积是18平方米，长是6米，要在周围围篱笆，篱笆长多少米？
<gadget id="calculator">18 / 6</gadget>
<output>3</output>

<gadget id="calculator">6 + 3</gadget>
<output>9</output>

<gadget id="calculator">9 * 2</gadget>
<output>18</output>

<result>18</result>