The perimeter of a square flower bed is 40 meters, and a potted flower is placed every 2 meters around it, how many potted flowers can be placed in total.
一个正方形花坛周长是40米，在它的四周每隔2米放一盆花，一共可以放多少盆花．
<gadget id="calculator">40 / 2</gadget>
<output>20</output>

<result>20</result>