Xiaofang ran 4 laps along a square flower bed, a total of 400 meters. What is the side length of this square flower bed?
小芳沿一个正方形花坛跑了4圈，一共是400米．这个正方形花坛的边长是多少米？
<gadget id="calculator">400 / 4</gadget>
<output>100</output>

<gadget id="calculator">100 / 4</gadget>
<output>25</output>

<result>25</result>