If the width of a rectangle is increased by 3 centimeters, the area will increase by 24 square centimeters. At this time, the figure is exactly a square. What is the area of the original rectangle in square centimeters?
一个长方形，如果宽增加3厘米，面积就增加24平方厘米，这时的图形正好是一个正方形，原来长方形的面积是多少平方厘米．
<gadget id="calculator">24 / 3</gadget>
<output>8</output>

<gadget id="calculator">8 * 8</gadget>
<output>64</output>

<gadget id="calculator">64 - 24</gadget>
<output>40</output>

<result>40</result>