0.1: how much = (1/5): (1/25).
0.1：多少=(1/5)：(1/25)．
<gadget id="calculator">0.1 / 25</gadget>
<output>0.004</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">0.004 / (1/5)</gadget>
<output>0.02</output>

<result>0.02</result>