The garden workers planted a tree every 6 meters on the side of the 60-meter-long path (both end and end). Now it is changed to plant a tree every 4 meters. How many trees do not need to be transplanted?
园林工人在长60米的小路一旁每隔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">60 / 12</gadget>
<output>5</output>

<gadget id="calculator">5 + 1</gadget>
<output>6</output>

<result>6</result>