The ratio of the side lengths of the big and small squares is 5:2, the side length of the big square is 20 meters, what is the area of the small square?
大小两正方形边长之比是5：2，大正方形的边长是20米，小正方形的面积是多少？
<gadget id="calculator">20 / 5</gadget>
<output>4</output>

<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<gadget id="calculator">8 * 8</gadget>
<output>64</output>

<result>64</result>