The ratio of white rabbits to gray rabbits is 5:4, which means that there are more white rabbits than gray rabbits.
白兔和灰兔的只数比是5：4，表示白兔比灰兔多多少．
<gadget id="calculator">5 - 4</gadget>
<output>1</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>