If two adjacent sides of a square are reduced by 20% and the other is increased by 3 cm, the area of the resulting rectangle is equal to the area of the original square. What is the area of the original square in square centimeters?
一个正方形相邻的两条边，一边减少20%，另一边增加3厘米，所得到长方形的面积与原正方形面积相等，那原正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">(4/5) / (1/5)</gadget>
<output>4</output>

<gadget id="calculator">3 * 4</gadget>
<output>12</output>

<gadget id="calculator">12 * 12</gadget>
<output>144</output>

<result>144</result>