Plant trees around a rectangular lawn with a length of 108 meters and a width of 60 meters, and plant one tree every 12 meters. How many trees can be planted around this rectangular lawn?
在长108米，宽60米的长方形草地四周种树，每12米种一棵，围绕这块长方形草地最多能种多少棵树？
<gadget id="calculator">108 + 60</gadget>
<output>168</output>

<gadget id="calculator">168 * 2</gadget>
<output>336</output>

<gadget id="calculator">336 / 12</gadget>
<output>28</output>

<result>28</result>