There are 27 poplars in the campus, which are willows (9/10). How many willows are there?
校园里有杨树27棵，是柳树的(9/10)，柳树多少棵？
<gadget id="calculator">9 / 10</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">27 / (9/10)</gadget>
<output>30</output>

<result>30</result>