How many potted flowers are needed to place potted flowers every 3 meters on the edge of a circular flower bed with a circumference of 30 meters.
在一个周长是30米的圆形花坛边上每隔3米摆一盆花，共需要多少盆花．
<gadget id="calculator">30 / 3</gadget>
<output>10</output>

<result>10</result>