(4/9):(1/6)=Χ:15.
(4/9)：(1/6)=Χ：15．
<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">(4/9) * 15</gadget>
<output>20/3 = around 6.666667</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(20/3) / (1/6)</gadget>
<output>40</output>

<result>40</result>