A road is 500 meters long. Trees are planted on the side of the road. There is no need to plant trees at the beginning and end. If a total of 24 trees are to be planted, how many meters should they be planted?
一条公路长500米，在路的一旁栽树，起点和终点不用栽，如果一共要栽24棵，则每隔几米栽一棵？
<gadget id="calculator">24 + 1</gadget>
<output>25</output>

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

<result>20</result>