On one side of a road, from the beginning to the end, a tree is planted every 8 meters, and a total of 12 trees are planted. How many meters is the total length of this road?
在一条路的一侧，从头到尾，每隔8米栽一棵树，一共栽了12棵树，这条大道全长多少米？
<gadget id="calculator">12 - 1</gadget>
<output>11</output>

<gadget id="calculator">11 * 8</gadget>
<output>88</output>

<result>88</result>