There are x potted flowers, which are placed in 4 classes on average, and 9 pots are placed in each class.
有x盆花，平均摆放在4个班里，每个班里摆9盆．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">9 / (1/4)</gadget>
<output>36</output>

<result>36</result>