A rectangle has a length of 8 decimeters and a width of 5 decimeters. What is its circumference in meters.
一个长方形的长是8分米，宽是5分米．它的周长是多少米．
<gadget id="calculator">8 + 5</gadget>
<output>13</output>

<gadget id="calculator">2 / 10</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">13 * (1/5)</gadget>
<output>13/5 = around 2.6</output>

<result>13/5 = around 2.6</result>