There are 60 poplar trees in the street park, the number of pagoda trees is (5/6) the number of poplar trees, and the number of willow trees is (4/5) the number of pagoda trees. How many willow trees are there in the park?
街心公园里有杨树60棵，槐树棵数是杨树棵数的(5/6)，柳树棵数是槐树棵数的(4/5)．公园里有柳树多少棵？
<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">60 * (5/6) * (4/5)</gadget>
<output>40</output>

<result>40</result>