A rectangle has a length of 6 decimeters and a width of 4 decimeters. What is the circumference in meters?
一个长方形，长是6分米，宽是4分米，周长是多少米．
<gadget id="calculator">10 * 2</gadget>
<output>20</output>

<gadget id="calculator">20 / 10</gadget>
<output>2</output>

<result>2</result>