The number of peach trees is 1/3 of that of pear trees, and the number of pear trees is 2/5 of that of poplar trees. It is known that there are 60 peach trees, how many poplar trees are there?
桃树棵数是梨树的(1/3)，梨树的棵数是杨树的(2/5)，已知桃树有60棵，杨树有多少棵？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">60 / (1/3) / (2/5)</gadget>
<output>450</output>

<result>450</result>