If the length of a rectangle is reduced by 3 centimeters, it becomes a square, and its area is reduced by 48 square centimeters. What is the area of the original rectangle?
一个长方形的长减少3厘米后就成了一个正方形，面积比原来减少了48平方厘米，原来长方形的面积是多少？
<gadget id="calculator">48 / 3</gadget>
<output>16</output>

<gadget id="calculator">16 + 3</gadget>
<output>19</output>

<gadget id="calculator">19 * 16</gadget>
<output>304</output>

<result>304</result>