There is a circular flower bed with a circumference of 80 meters. Now plant 20 roses around the flower bed. How many meters are there between the two roses?
有一个圆形花坛，周长是80米，现在在花坛周围种上20棵月季花，问两棵月季花之间间隔多少米？
<gadget id="calculator">80 / 20</gadget>
<output>4</output>

<result>4</result>