If the length of a rectangle is increased by 5 cm, the area will increase by 40 cm2; if the width is increased by 5 cm, the area will increase by 60 cm2. What is the area of the original rectangle?
一个长方形，如果长增加5厘米，面积增加40平方厘米；如果宽增加5厘米，面积增加60平方厘米，原来长方形面积是多少平方厘米．
<gadget id="calculator">60 / 5</gadget>
<output>12</output>

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

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

<result>96</result>