A circular pond with a circumference of 100 meters is filled with willow trees every 5 meters, how many willow saplings are needed to carry it all.
一个周长100米的圆形池塘，每隔5米载一棵柳树，需要多少棵柳树苗才能载完．
<gadget id="calculator">100 / 5</gadget>
<output>20</output>

<result>20</result>