The garden workers planted a tree every 6 meters on both sides of the 96-meter-long road (both ends are planted), and now it is changed to plant a tree every 4 meters, so how many trees do not need to be transplanted?
园林工人在长96米的公路两边每隔6米栽一棵树(首尾都栽)，现在要改成每隔4米栽一棵树，那么不用移栽的树有多少棵．
<gadget id="calculator">96 / 12</gadget>
<output>8</output>

<gadget id="calculator">8 + 1</gadget>
<output>9</output>

<gadget id="calculator">9 * 2</gadget>
<output>18</output>

<result>18</result>