If a peach tree is planted every 20m around a fish pond with a circumference of 600m, how many saplings are needed in total?
在一个周长是600m的鱼塘周围，每隔20m种一棵桃树，一共需要多少棵树苗．
<gadget id="calculator">600 / 20</gadget>
<output>30</output>

<result>30</result>