There is a square lawn in the campus, the side length is 15m, and its area is equal to the area of another rectangular lawn. It is known that the width of a rectangular lawn is 9m, what is its length?
校园里有一块正方形草地，边长是15m，它的面积与另一块长方形草地面积相等．已知长方形草地宽9m，它的长是多少．
<gadget id="calculator">15 * 15</gadget>
<output>225</output>

<gadget id="calculator">225 / 9</gadget>
<output>25</output>

<result>25</result>