If the width of a rectangle is increased by 1 cm or the length is increased by 2 cm, the area is the same. If the original width of the rectangle is 5 cm, what is the area of the original rectangle in square centimeters?
一个长方形的宽增加1厘米或长增加2厘米后面积相同，如果这个长方形原来的宽是5厘米，原长方形的面积是多少平方厘米．
<gadget id="calculator">10 * 5</gadget>
<output>50</output>

<result>50</result>