After subtracting 4 centimeters from the length of a rectangle, 24 square centimeters are reduced, and the remaining part is exactly a square. What is the area of the rectangle in square centimeters?
一个长方形的长去掉4厘米后，减少了24平方厘米，剩下的部分恰好是一个正方形，原来这个长方形的面积是多少平方厘米．
<gadget id="calculator">24 / 4</gadget>
<output>6</output>

<gadget id="calculator">6 * 6</gadget>
<output>36</output>

<gadget id="calculator">36 + 24</gadget>
<output>60</output>

<result>60</result>