The length of a rectangle is 2 decimeters and the width is 5 centimeters. What is the perimeter of the rectangle in centimeters?
一个长方形长是2分米，宽是5厘米，这个长方形的周长是多少厘米
<gadget id="calculator">2 * 10</gadget>
<output>20</output>

<gadget id="calculator">20 + 5</gadget>
<output>25</output>

<gadget id="calculator">25 * 2</gadget>
<output>50</output>

<result>50</result>