If number A is 125% of number B, then number B is the number of A.
甲数是乙数的125%，则乙数是甲数的多少．
<gadget id="calculator">125 / 100</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">1 / (5/4)</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>