If one side of a square is reduced by 25% and the other side is increased by 3 meters, the resulting rectangle has exactly the same area as the original square. What is the area of the square?
一个正方形，如果一边减少25%，另一边增加3米，所得到的长方形与原来正方形面积正好相等，那么正方形面积是多少？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(3/4) / (1/4)</gadget>
<output>3</output>

<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<gadget id="calculator">9 * 9</gadget>
<output>81</output>

<result>81</result>