If a tree is planted every 4 meters on one side of a road, and a total of 86 saplings are used, how many meters does the road have in total?
在一条马路的一侧每隔4米栽一棵树，一共用了86棵树苗，那么这条公路共有多少米．
<gadget id="calculator">86 - 1</gadget>
<output>85</output>

<gadget id="calculator">85 * 4</gadget>
<output>340</output>

<result>340</result>