The ratio of the length to the width of a rectangle is 7:3. If the length is reduced by 12 cm and the width is increased by 16 cm, a square is formed. What is the area of the original rectangle in square centimeters?
长方形的长和宽的比是7：3，若将长减少12厘米，宽增加16厘米就变成一个正方形，原来长方形的面积是多少平方厘米．
<gadget id="calculator">12 + 16</gadget>
<output>28</output>

<gadget id="calculator">7 - 3</gadget>
<output>4</output>

<gadget id="calculator">28 / 4</gadget>
<output>7</output>

<gadget id="calculator">7 * 7 * 7 * 3</gadget>
<output>1_029</output>

<result>1_029</result>