road is 500 meters long. It is planned to plant 48 trees on both sides of the road. The starting point and the ending point are stop signs. There is no need to plant trees. What is the average meter to plant a tree?
一条公路长500米，计划在公路的两边栽48棵树，起点和终点是站牌，不用栽树，平均多少米栽一棵树？
<gadget id="calculator">48 / 2</gadget>
<output>24</output>

<gadget id="calculator">24 + 1</gadget>
<output>25</output>

<gadget id="calculator">500 / 25</gadget>
<output>20</output>

<result>20</result>