A rectangle is 6 cm long. If you cut off 20% of the length of the rectangle, the rectangle becomes a square. What is the area of the original rectangle?
一个长方形长6厘米，如果把这个长方形的长剪掉20%，这个长方形就变成了正方形．则原来长方形的面积是多少平方厘米？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">6 * (4/5) * 6</gadget>
<output>144/5 = around 28.8</output>

<result>144/5 = around 28.8</result>