How many tons is (1/4) used for (2/3) ton of coal?
(2/3)吨煤用去(1/4)是多少吨．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

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

<gadget id="calculator">(2/3) * (1/4)</gadget>
<output>1/6 = around 0.166667</output>

<result>1/6 = around 0.166667</result>