There are 20 poplars in the campus, willows are poplars (3/4), pagoda trees are willows (3/5). How many locust trees are there?
校园里有杨树20棵，柳树是杨树的(3/4)，槐树是柳树的(3/5)．槐树有多少棵？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">20 * (3/4) * (3/5)</gadget>
<output>9</output>

<result>9</result>