If the number of boys in a school is reduced by 20% and is equal to the number of girls, what percentage of the number of boys and girls in this school are girls
某学校男生人数减少20%后与女人数相等，这个学校男女生人数中女生是男生的多少
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

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

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