Plant trees around a square pool with a side length of 60 meters, and plant willow trees every 3 meters. How many willow trees should be planted in total?
在一个边长为60米的正方形水池四周种树，每隔3米种一棵柳树，一共要种多少棵柳树．
<gadget id="calculator">4 / 3</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">60 * (4/3)</gadget>
<output>80</output>

<result>80</result>