If a:2=0.2:5, then a=how much.
如果a：2=0.2：5，那么a=多少．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">0.2 * (2/5)</gadget>
<output>0.08</output>

<result>0.08</result>