The number of A is 24, which is exactly (2/5) of the number of B. What is the number of B?
甲数是24，正好是乙数的(2/5)，乙数是多少？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">24 / (2/5)</gadget>
<output>60</output>

<result>60</result>