If the length of a rectangle is 18 decimeters and the width is 12 decimeters, what is its perimeter in meters?
一个长方形的长是18分米，宽是12分米，它的周长是多少米．
<gadget id="calculator">18 + 12</gadget>
<output>30</output>

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

<gadget id="calculator">30 * (1/5)</gadget>
<output>6</output>

<result>6</result>