It is known that A is 25% more than B, then how much is B equal to A
已知A比B多25%，那么B是A的多少
<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">1 / (5/4)</gadget>
<output>4/5 = around 0.8</output>

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