A piece of isosceles trapezoidal green land, the upper base is 18 meters long, the lower base is twice as long as the upper base, and the waist is 25 meters long. Try to find the perimeter of this green land?
一块等腰梯形绿地，上底长18米，下底是上底的2倍，腰长25米，试求出这块绿地的周长？
<gadget id="calculator">18 * 2</gadget>
<output>36</output>

<gadget id="calculator">18 + 36 + 25 + 25</gadget>
<output>104</output>

<result>104</result>