Plant trees on both sides of a road, a total of 32 trees are planted, one tree is planted every 8 meters (one tree is planted at each end), how many meters is this road long?
在一条道路的两旁栽树，一共栽了32棵，每隔8米栽一棵(两端各栽一棵)，这条路长多少米？
<gadget id="calculator">32 / 2</gadget>
<output>16</output>

<gadget id="calculator">16 - 1</gadget>
<output>15</output>

<gadget id="calculator">15 * 8</gadget>
<output>120</output>

<result>120</result>