24 is equal to (4/5) of the number B, what is the number B?
24等于乙数的(4/5)，乙数是多少．
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">24 / (4/5)</gadget>
<output>30</output>

<result>30</result>