The round skating rink has a total length of 200 meters. If a lamp is installed every 10 meters along this circle, how many lamps need to be installed in total?
圆形溜冰场的一周全长200米．如果沿着这一圈每隔10米安装一盏灯，一共需要安装多少盏灯．
<gadget id="calculator">200 / 10</gadget>
<output>20</output>

<result>20</result>