For a pile of coal (1/3), it takes 4 trucks to transport it away, and how many trucks are needed to transport the rest.
一堆煤的(1/3)，运了4车才运走，剩下的还要多少车才能运完．
<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">(1/3) / 4</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">(2/3) / (1/12)</gadget>
<output>8</output>

<result>8</result>