Solution ratio: 0.45:ⅹ=(3/20):(1/3).
解比例：0.45：ⅹ=(3/20)：(1/3)．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">20 / 3</gadget>
<output>20/3 = around 6.666667</output>

<gadget id="calculator">0.45 * (1/3) * (20/3)</gadget>
<output>1</output>

<result>1</result>