The side length of a square is increased by 5 cm, and the area is increased by 125 cm**2. What is the area of the original square?
一个正方形的边长增加5CM，面积增加125cm**2，原来正方形的面积是多少．
<gadget id="calculator">5 ** 2</gadget>
<output>25</output>

<gadget id="calculator">125 / 25</gadget>
<output>5</output>

<result>5</result>