The length of the mathematical writing is 3 decimeters, the width is 2 decimeters, how many decimeters is the circumference.
数学书面的长是3分米，宽2分米，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>