The perimeter of the rectangle is 3.24 meters, the width is 0.8 meters, what is the length in meters?
长方形的周长是3.24米，宽是0.8米，长是多少米？
<gadget id="calculator">3.24 / 2</gadget>
<output>1.62</output>

<gadget id="calculator">1.62 - 0.8</gadget>
<output>0.82</output>

<result>0.82</result>