There are 20 poplar trees in the campus, the number of locust trees is poplar (9/10), and willow (2/3), how many willows are there?
校园里有杨树20棵，槐树的棵数是杨树的(9/10)，又是柳树的(2/3)，柳树有多少棵？
<gadget id="calculator">9 / 10</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(9/10) / (2/3)</gadget>
<output>27/20 = around 1.35</output>

<gadget id="calculator">20 * (27/20)</gadget>
<output>27</output>

<result>27</result>