If x: (4/5) = 0.15: 2.5, then x = how much.
如果x：(4/5)=0.15：2.5，那么x=多少．
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(4/5) * 0.15</gadget>
<output>0.12</output>

<gadget id="calculator">0.12 / 2.5</gadget>
<output>0.048</output>

<result>0.048</result>