Plant a tree every 4 meters on both sides of the runway. As a result, the distance between the first and last tree is 48 meters. Now the trees are transplanted to be planted every 6 meters. How many of them do not need to be transplanted?
在跑道两侧每隔4米种一棵树，结果第一棵与最后一棵相距48米，现在将树移栽成每隔6米种一棵，其中有几棵不需要移栽？
<gadget id="calculator">48 / 12</gadget>
<output>4</output>

<gadget id="calculator">4 + 1</gadget>
<output>5</output>

<result>5</result>