When the length and width of a rectangle are increased by 5 cm, its area increases by 125 cm2. What is the perimeter of the original rectangle in centimeters?
一个长方形的长和宽都增长5厘米后，它的面积就增加125平方厘米．原来长方形的周长是多少厘米？
<gadget id="calculator">20 * 2</gadget>
<output>40</output>

<result>40</result>