If the width of a rectangle is increased by 3 centimeters, the area will increase by 27 square centimeters, and it becomes a square. What is the area of the original rectangle in square centimeters?
一个长方形，它的宽增加3厘米，面积就增加27平方厘米，正好变成一个正方形，原来的长方形面积是多少平方厘米．
<gadget id="calculator">27 / 3</gadget>
<output>9</output>

<gadget id="calculator">9 - 3</gadget>
<output>6</output>

<gadget id="calculator">9 * 6</gadget>
<output>54</output>

<result>54</result>