There are 50 poplars in the campus, the willows are poplars (4/5), the pagodas are willows (3/4), how many pagodas are there?
校园里有杨树50棵，柳树是杨树的(4/5)，槐树是柳树的(3/4)，槐树有多少棵？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">50 * (4/5) * (3/4)</gadget>
<output>30</output>

<result>30</result>