The number of poplar trees is 4/5 of the number of pagoda trees. It is known that there are 16 poplar trees. How many pagoda trees are there?
杨树的棵数是槐树棵数的(4/5)，已知杨树有16棵，槐树有多少棵？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">16 / (4/5)</gadget>
<output>20</output>

<result>20</result>