There is an isosceles trapezoidal flower bed in Experimental Primary School. The upper base of the flower bed is 6 meters long, the lower base is 8 meters long, and the waist is 5 meters long. If there is a guardrail around the flower bed, how long is the guardrail?
实验小学有一个等腰梯形的花坛，花坛上底长6米，下底长8米，腰长5米．如果在花坛四周围上护栏，护栏长多少米？
<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<gadget id="calculator">6 + 8 + 10</gadget>
<output>24</output>

<result>24</result>