The ratio of the number of white rabbits to black rabbits is 5:6, so the number of black rabbits is equal to the number of white rabbits.
白兔和黑兔只数的比是5：6，则黑兔的只数是白兔的多少．
<gadget id="calculator">5 + 6</gadget>
<output>11</output>

<gadget id="calculator">6 / 11</gadget>
<output>6/11 = around 0.545455</output>

<gadget id="calculator">5 / 11</gadget>
<output>5/11 = around 0.454545</output>

<gadget id="calculator">(6/11) / (5/11)</gadget>
<output>6/5 = around 1.2</output>

<result>6/5 = around 1.2</result>