The number of A is 30, the number of A is 25% more than the number of B, what is the number of B
甲数是30，甲数比乙数多乙数的25%，乙数是多少
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 + (1/4)</gadget>
<output>5/4 = around 1.25</output>

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

<result>24</result>