There are 120 poplars in the campus, and the willows are 1/4 of the poplars. How many willows are there?
校园里有杨树120棵，柳树是杨树的(1/4)，柳树有多少棵？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">120 * (1/4)</gadget>
<output>30</output>

<result>30</result>