A circular flower bed has a circumference of 60 meters, and potted flowers are placed every 4 meters, so how many potted flowers are needed to fill the flower bed.
一个圆形花坛，周长60米，每隔4米摆一盆花，那么摆满这个花坛一共要多少盆花．
<gadget id="calculator">60 / 4</gadget>
<output>15</output>

<result>15</result>