20 meters (1/4) is exactly 6 meters ((())/(())); what is 30 meters (5/6).
20米的(1/4)正好是6米的((())/(()))；30米是多少的(5/6)．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/4) / 6</gadget>
<output>1/24 = around 0.041667</output>

<gadget id="calculator">20 * (1/24)</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">30 / (5/6)</gadget>
<output>36</output>

<result>36</result>