There is a lake with a circumference of 840 meters. It is planned to plant a tree every 4 meters around the lake. So, how many trees can be planted in total?
有一周长为840米的胡泊，计划沿胡泊周围每隔4米种一棵树．那么，一共能种多少棵？
<gadget id="calculator">840 / 4</gadget>
<output>210</output>

<result>210</result>