If the length of a rectangle is reduced by 5 cm, it becomes a square with a perimeter of 24 cm. What is the area of this rectangle in square centimeters?
如果把一个长方形的长减少5厘米后，就成了一个周长是24厘米的正方形．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 + 5</gadget>
<output>11</output>

<gadget id="calculator">11 * 6</gadget>
<output>66</output>

<result>66</result>