The number of A is less than the number of B (1/4), the number of A is 15, what is the number of B
甲数比乙数少(1/4)，甲数是15，乙数是多少
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">15 / (3/4)</gadget>
<output>20</output>

<result>20</result>