A 12 decimeter long iron wire is folded into a rectangle whose length is twice the width, what is the area of the rectangle in square decimeters?
用一根长12分米的铁丝折成一个长方形，长是宽的2倍，这个长方形的面积是多少平方分米．
<gadget id="calculator">2 + 1</gadget>
<output>3</output>

<gadget id="calculator">12 / 2 / 3</gadget>
<output>2</output>

<gadget id="calculator">2 * 2 * 2</gadget>
<output>8</output>

<result>8</result>