If the length of a rectangle is reduced by 2 cm, the area will be reduced by 20 cm2; if the width is increased by 3 cm, it will become a square. What is the area of the original rectangle in square centimeters?
一个长方形，如果长减少2厘米，面积就减少20平方厘米；如果宽增加了3厘米，就成了一个正方形．原来长方形的面积是多少平方厘米．
<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<gadget id="calculator">10 + 3</gadget>
<output>13</output>

<gadget id="calculator">13 * 10</gadget>
<output>130</output>

<result>130</result>