If the width of a rectangle is increased by 4 cm, it becomes a square and its area increases by 48 cm2. What is the area of the original rectangle?
一个长方形的宽增加4厘米，就成为一个正方形，面积就增加48平方厘米，原来长方形的面积是多少平方厘米．
<gadget id="calculator">48 / 4</gadget>
<output>12</output>

<gadget id="calculator">12 - 4</gadget>
<output>8</output>

<gadget id="calculator">12 * 8</gadget>
<output>96</output>

<result>96</result>