How many willow trees can be planted at intervals of 6 meters on the edge of a circular fish pond with a circumference of 120 meters?
在一个周长为120米的圆形鱼池边上每隔6米栽一棵柳树，一共可以栽多少棵柳树．
<gadget id="calculator">120 / 6</gadget>
<output>20</output>

<result>20</result>