There is a square flower bed in a certain school surrounded by a 1-meter-wide sidewalk paved with cobblestones. Given that the area of this path is 24 square meters, how big is the area of this flower bed?
某校有一个正方形花坛，花坛四周是用鹅卵石铺成的1米宽的人行小道．已知这条小道的面积是24平方米，则这个花坛的面积有多大？
<gadget id="calculator">24 - 4</gadget>
<output>20</output>

<gadget id="calculator">20 / 4</gadget>
<output>5</output>

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

<result>25</result>