A rectangular piece of land is 50 meters long, and the length is 10 meters more than the width. What is the perimeter of the grass in meters?
一块长方形地，长50米，长比宽多10米，这块草地的周长是多少米？
<gadget id="calculator">50 - 10</gadget>
<output>40</output>

<gadget id="calculator">40 + 50</gadget>
<output>90</output>

<gadget id="calculator">90 * 2</gadget>
<output>180</output>

<result>180</result>