There are two squares with a difference of 20 cm in perimeter and 55 cm in area, what is the area of the smaller square?
有两个正方形，它们的周长相差20厘米，面积相差55平方厘米，其中小正方形的面积是多少？
<gadget id="calculator">5 * 5</gadget>
<output>25</output>

<gadget id="calculator">55 - 25</gadget>
<output>30</output>

<gadget id="calculator">30 / 2 / 5</gadget>
<output>3</output>

<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<result>9</result>