The length of the upper base of an isosceles trapezoid is 4 cm, the length of the lower base is twice the length of the upper base, and the length of the waist is 5 cm. What is the perimeter of the trapezoid in cm?
一个等腰梯形上底长是4厘米，下底长是上底长的2倍，腰长是5厘米，这个梯形的周长是多少厘米？
<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<gadget id="calculator">4 + 8 + 5 + 5</gadget>
<output>22</output>

<result>22</result>