A wire is 3.6 meters long and bent into a rectangle. The length of the rectangle is twice the width. What is its area? (solution by equation)
一根铁丝长3.6米，弯成一个长方形，该长方形的长是宽的2倍，它的面积是多少？(用方程解)
<gadget id="calculator">0.4 * 2</gadget>
<output>0.8</output>

<gadget id="calculator">0.4 * 0.8</gadget>
<output>0.32</output>

<result>0.32</result>