There is a rectangle, if its length is extended by 13 centimeters, its area will increase by 65 square centimeters, if its width is increased by 8 centimeters, its area will increase by 96 square centimeters. What is the area of the original rectangle in square centimeters?
有一个长方形，如果把它的长延长13厘米，则面积增加65平方厘米，如果把宽增加8厘米，则面积增加96平方厘米．请问原来长方形的面积是多少平方厘米？
<gadget id="calculator">96 / 8</gadget>
<output>12</output>

<gadget id="calculator">65 / 13</gadget>
<output>5</output>

<gadget id="calculator">12 * 5</gadget>
<output>60</output>

<result>60</result>