A square orchard with a side length of 300 meters. If an automatic sprinkler with a range of 10 meters is used for irrigation, how many such sprinklers are needed? (Retain integers)
一块边长300米的正方形果园．如果用射程是10米的自动喷灌装置进行喷灌，大约需要多少这样的喷灌装置？(得数保留整数)
<gadget id="calculator">10 * 2</gadget>
<output>20</output>

<gadget id="calculator">300 / 20</gadget>
<output>15</output>

<gadget id="calculator">15 * 15</gadget>
<output>225</output>

<result>225</result>