What is the perimeter of a rectangle that is 60 meters long and 50 meters wide?
一个长方形的长60米，宽50米，它的周长是多少．
<gadget id="calculator">60 + 50</gadget>
<output>110</output>

<gadget id="calculator">110 * 2</gadget>
<output>220</output>

<result>220</result>