(4/17) of 50 is equivalent to ((())/(())) of 60.
50的(4/17)相当于60的((())/(()))．
<gadget id="calculator">4 / 17</gadget>
<output>4/17 = around 0.235294</output>

<gadget id="calculator">(4/17) / 60</gadget>
<output>1/255 = around 0.003922</output>

<gadget id="calculator">50 * (1/255)</gadget>
<output>10/51 = around 0.196078</output>

<result>10/51 = around 0.196078</result>