A circular runway is 200 meters long. If one billboard is erected every 10 meters, how many billboards can be erected in total?
一个圆形跑道长200米，如果每10米竖一个广告牌，一共可以竖多少个．
<gadget id="calculator">200 / 10</gadget>
<output>20</output>

<result>20</result>