The school has a rectangular flower bed, 15.3 meters long and 9.6 meters wide. Use a fence to surround the flower bed, how long is the fence?
学校有一个长方形花坛，长15.3米，宽9.6米．用篱笆把花坛围起来，篱笆长多少？
<gadget id="calculator">15.3 + 9.6</gadget>
<output>24.9</output>

<gadget id="calculator">24.9 * 2</gadget>
<output>49.8</output>

<result>49.8</result>