The circumference of a circular flower bed is 300 meters, and a lamp is installed every 15 meters on its side, how many lamps are needed in total.
一个圆形花坛的周长是300米，在它的边上每隔15米安装一盏灯，一共需要装多少盏灯．
<gadget id="calculator">300 / 15</gadget>
<output>20</output>

<result>20</result>