A rectangular flower bed is 14.5 meters long and 5.8 meters wide. If a fence is added to this flower bed, how long will the fence be?
一个长方形花坛，长14.5米，宽5.8米．如果给这个花坛加一圈栅栏，那么需要多长的栅栏？
<gadget id="calculator">14.5 + 5.8</gadget>
<output>20.3</output>

<gadget id="calculator">20.3 * 2</gadget>
<output>40.6</output>

<result>40.6</result>