The number of girls is the number of boys (4/5), how many percent are girls less than boys?
女生人数是男生人数的(4/5)，女生比男生少百分之几？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 - (4/5)</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>