If the length of a rectangle is 10 meters and the width is 6 meters, what is the perimeter of the rectangle?
一个长方形的长是10米，宽是6米，长方形的周长是多少米．
<gadget id="calculator">10 + 6</gadget>
<output>16</output>

<gadget id="calculator">16 * 2</gadget>
<output>32</output>

<result>32</result>