A rectangular handkerchief is 3 decimeters long and 2 decimeters wide, what is its perimeter?
一块长方形的手帕，长是3分米，宽是2分米，它的周长是多少分米
<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<result>10</result>