There is a rectangular flowerbed with a width of 30 meters, and the largest square is divided from it to plant roses, and the remaining 600 square meters are planted with rhododendrons. Find the area of the original flowerbed in square meters?
有一个宽是30米的长方形花圃，从中分割出一个最大的正方形地种植玫瑰花，剩下的600平方米地种植杜鹃花，求原来的花圃的面积是多少平方米？
<gadget id="calculator">30 * 30</gadget>
<output>900</output>

<gadget id="calculator">900 + 600</gadget>
<output>1_500</output>

<result>1_500</result>