The circumference of a lake is 1500 meters, and there is a long stone bench every 50 meters around the lake for people to rest. Three willow trees are planted equidistantly between every two stone benches. How many willow trees are there in total around the lake?
一个湖泊周长是1500米，在湖泊的周围每隔50米有一张长条石凳供人们休息．每两个石凳之间等距离地种植着3棵柳树，在这个湖泊周围一共有柳树多少棵？
<gadget id="calculator">1_500 / 50</gadget>
<output>30</output>

<gadget id="calculator">30 * 3</gadget>
<output>90</output>

<result>90</result>