The circumference of a circular fish pond is 180 meters. Now it is necessary to plant a number of willows around it. Plant a willow every 6 meters. How many willows are needed in total?
一个圆形养鱼池的周长是180米，现在要在它周围种上柳数，每隔6米栽一棵，一共需要多少棵？
<gadget id="calculator">180 / 6</gadget>
<output>30</output>

<result>30</result>