There is a telephone pole every 10 meters on a road, and there are 24 poles at both ends. How many meters is this road?
一条路上每隔10米有一根电线杆，连两端一共有24根，这条路有多少米长．
<gadget id="calculator">24 - 1</gadget>
<output>23</output>

<gadget id="calculator">10 * 23</gadget>
<output>230</output>

<result>230</result>