The length of a rectangular flower bed is 50 meters and twice the width, what is the perimeter of this rectangular flower bed in meters?
一块长方形花坛的长是50米，是宽的2倍，这块长方形花坛的周长是多少米？
<gadget id="calculator">50 / 2</gadget>
<output>25</output>

<gadget id="calculator">25 + 50</gadget>
<output>75</output>

<gadget id="calculator">75 * 2</gadget>
<output>150</output>

<result>150</result>