A steel pipe, if (3/4) of it is used up, there are 6 meters left; if (5/6) of it is used up, how many meters are left.
一根钢管，如果用去它的(3/4)后，还剩下6米；如果用去它的(5/6)还剩多少米．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">6 / (1/4)</gadget>
<output>24</output>

<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">24 * (5/6)</gadget>
<output>20</output>

<result>20</result>