The perimeter of a rectangle is 60 cm. If the length is reduced by 25% and the width is increased by 5 cm, it becomes a square. What is the area of the rectangle in square centimeters?
一个长方形的周长是60厘米，如果长减少25%，宽增加5厘米，就变成一个正方形，这个长方形的面积是多少平方厘米？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">5 / (1/4)</gadget>
<output>20</output>

<gadget id="calculator">60 / 2</gadget>
<output>30</output>

<gadget id="calculator">30 - 20</gadget>
<output>10</output>

<gadget id="calculator">20 * 10</gadget>
<output>200</output>

<result>200</result>