Plant trees on both sides of a road, every 10 meters, and plant a total of 25 trees on one side of the road (both head and tail). How many meters is this road?
在一条公路的两侧种树，每隔10米种一棵，公路一侧一共种了25棵树(头尾都种)．这条公路长多少米？
<gadget id="calculator">25 - 1</gadget>
<output>24</output>

<gadget id="calculator">24 * 10</gadget>
<output>240</output>

<result>240</result>