The tree-planting team plans to plant a row of trees on both sides of a 100-meter-long road. There are 52 trees in total. They are planted at both ends of the road. On average, how many meters should there be between two adjacent trees?
植树队计划在一条长100米的道路两旁各栽一行树，共有52棵树，路的两端都栽，平均每相邻的两棵树中间应隔多少米．
<gadget id="calculator">52 / 2</gadget>
<output>26</output>

<gadget id="calculator">26 - 1</gadget>
<output>25</output>

<gadget id="calculator">100 / 25</gadget>
<output>4</output>

<result>4</result>