Install street lights on one side of a 1000m road, and install one every 50m (only one end is installed), how many street lights should be installed in total?
在一条1000m的公路一侧安装路灯，每隔50m安一座(只安装一端)，一共要安装多少座路灯？
<gadget id="calculator">1_000 / 50</gadget>
<output>20</output>

<result>20</result>