The number of white rabbits is 25% more than that of black rabbits, and the number of black rabbits is much less than that of white rabbits.
白兔只数比黑兔多25%，黑兔只数比白兔少多少．
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 + (1/4)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">(1/4) / (5/4)</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>