The circumference of a circular pool is 180 meters. If willows are planted along the perimeter of the pool, one tree is planted every 6 meters. How many trees are planted in total?
一个圆形水池周长为180米，若沿着水池周围种上柳树，每隔6米栽一棵，一共栽几棵？
<gadget id="calculator">180 / 6</gadget>
<output>30</output>

<result>30</result>