Plant trees next to a circular pool with a circumference of 36 meters, and plant one tree every 3 meters. How many trees can be planted in total?
在一个周长36米的圆形水池旁植树，每隔3米植一棵，一共可植多少棵．
<gadget id="calculator">36 / 3</gadget>
<output>12</output>

<result>12</result>