If x:5=0.4:8, then x=how much.
如果x：5=0.4：8，那么x=多少．
<gadget id="calculator">0.4 * 5</gadget>
<output>2</output>

<gadget id="calculator">2 / 8</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>