If the number of people in class 1 is more than the number of people in class 2 (1/4), then the number of people in class 2 is less than the number of people in class 1.
如果一班人数比二班人数多(1/4)，那么二班人数比一班人数少多少．
<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>