The length of the rectangle is 25 cm and the width is 2 decimeters, what is its perimeter?
长方形长是25厘米，宽是2分米，它的周长是多少？
<gadget id="calculator">2 * 10</gadget>
<output>20</output>

<gadget id="calculator">20 + 25</gadget>
<output>45</output>

<gadget id="calculator">45 * 2</gadget>
<output>90</output>

<result>90</result>