The number of girls is 3/5 of the number of boys, and the number of girls is less than the number of boys.
女生人数是男生人数的(3/5)，女生人数比男生人数少多少．
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>