Solution ratio: (5/6)X=1.6:0.4.
解比例：(5/6)X=1.6：0.4．
<gadget id="calculator">1.6 / 0.4</gadget>
<output>4</output>

<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">4 / (5/6)</gadget>
<output>24/5 = around 4.8</output>

<result>24/5 = around 4.8</result>