A road is 1000 meters long, and a total of 51 trees are planted on one side of the road (both ends are planted). How many meters are there between every two trees?
一条大路有1000米，路的一边一共栽了51棵树(两端都栽)．每两棵树之间是多少米？
<gadget id="calculator">51 - 1</gadget>
<output>50</output>

<gadget id="calculator">1_000 / 50</gadget>
<output>20</output>

<result>20</result>