A pile of coal has (5/6) tons, if (1/3) is used up, how many tons are left?
一堆煤有(5/6)吨，用去(1/3)，还剩多少吨？
<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(5/6) * (2/3)</gadget>
<output>5/9 = around 0.555556</output>

<result>5/9 = around 0.555556</result>