There is a round flower bed in the school, and there are 18 pots of roses around it. Now every two pots of roses are placed with a pot of camellia, so how many pots of flowers are there around this flower bed?
学校有个圆形花坛，周围摆了18盆月季花，现在每隔两盆月季花摆一盆茶花，那么这个花坛周围共有盆花多少？
<gadget id="calculator">18 / 2</gadget>
<output>9</output>

<gadget id="calculator">9 + 18</gadget>
<output>27</output>

<result>27</result>