There are 90 pine trees in the park, exactly (3/4) of poplar trees, and the number of willow trees is (5/6) of poplar trees. How many willow trees are there?
公园里有松树90棵，正好是杨树的(3/4)，柳树的棵数是杨树的(5/6)，柳树有多少棵？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">90 / (3/4)</gadget>
<output>120</output>

<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">120 * (5/6)</gadget>
<output>100</output>

<result>100</result>