How many trees can be planted by planting trees at an interval of 9 meters by a lake with a circumference of 900 meters?
在一个周长900米的湖边栽树，每隔9米载一棵，可栽树多少棵？
<gadget id="calculator">900 / 9</gadget>
<output>100</output>

<result>100</result>