If the number of boys in the chorus is equal to the number of girls after increasing by 25%, what percentage of the original number of boys is the number of girls?
合唱队男生如果增加25%后与女生人数相等，那么原来的男生人数是女生人数的百分之几？
<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>