The ratio of the length to the width of a rectangle is 5:3. If the length is reduced by 9 cm and the width is increased by 7 cm, it becomes a square. What is the area of the original rectangle in square centimeters?
长方形的长和宽的比是5：3，如果将长减少9厘米，宽增加7厘米，就变成一个正方形，原来长方形面积是多少平方厘米．
<gadget id="calculator">9 + 7</gadget>
<output>16</output>

<gadget id="calculator">5 - 3</gadget>
<output>2</output>

<gadget id="calculator">16 / 2</gadget>
<output>8</output>

<gadget id="calculator">8 * 5</gadget>
<output>40</output>

<gadget id="calculator">8 * 3</gadget>
<output>24</output>

<gadget id="calculator">40 * 24</gadget>
<output>960</output>

<result>960</result>