A tree is planted every 9 meters on one side of a path, and both ends are planted. A total of 56 trees are planted. How long is this path in meters?
在一条小路的一边每隔9米栽一棵树，两端都栽，一共栽了56棵树，这条小路长多少米？
<gadget id="calculator">56 - 1</gadget>
<output>55</output>

<gadget id="calculator">9 * 55</gadget>
<output>495</output>

<result>495</result>