The round skating rink has a total length of 200 meters. If a light is installed every 20 meters along the ice rink, how many lights need to be installed in total?
圆形溜冰场的一周全长200米．如果沿溜冰场一周每隔20米安装一盏灯，一共需要安装几盏灯？
<gadget id="calculator">200 / 20</gadget>
<output>10</output>

<result>10</result>