Xiaodong has 20 black rabbits at home, which is equivalent to (4/5) the number of white rabbits. How many white rabbits does Xiaodong have at home?
小冬家养黑兔20只，相当于白兔只数的(4/5)，小冬家养白兔多少只？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">20 / (4/5)</gadget>
<output>25</output>

<result>25</result>