Plant trees along a circular pool with a circumference of 54 meters, and plant one tree every 6 meters, how many trees can be planted.
沿一个周长54米的圆形水池旁种树，每隔6米种一棵，可以种多少棵．
<gadget id="calculator">54 / 6</gadget>
<output>9</output>

<result>9</result>