There is a circular flower bed with a circumference of 120 meters. A lilac is planted every 6 meters. A rose is planted between every two lilacs. How many lilacs and roses are there?
有一个圆形花坛，一周120米，每隔6米种一棵紫丁香，每两棵紫丁香中间种一棵月季花，紫丁香和月季花各有多少棵？
<gadget id="calculator">120 / 6</gadget>
<output>20</output>

<result>20</result>