If the number of people in class A is more than that of class B (1/4), then the number of people in class B is less than that of class A.
甲班人数比乙班多(1/4)，则乙班人数比甲班少多少．
<gadget id="calculator">1 / 4</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">(1/4) / (5/4)</gadget>
<output>1/5 = around 0.2</output>

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