When the length of a rectangle is shortened by 5 cm, it becomes a square with an area reduced by 30 cm2. What is the area of this rectangle in square centimeters?
一个长方形的长缩短5厘米后，就变成一个正方形，面积减少了30平方厘米．这个长方形的面积是多少平方厘米？
<gadget id="calculator">30 / 5</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>