The width of a rectangular paddy field is 8.5 meters, and the length is 2.4 times the width. What is the perimeter of this rectangular paddy field in meters?
一块长方形水田的宽是8.5米，长是宽的2.4倍，这块长方形水田的周长是多少米？
<gadget id="calculator">8.5 * 2.4</gadget>
<output>20.4</output>

<gadget id="calculator">20.4 + 8.5</gadget>
<output>28.9</output>

<gadget id="calculator">28.9 * 2</gadget>
<output>57.8</output>

<result>57.8</result>