If the number of people in group A (1/5) is allocated to group B, then the number of people in group A and group B is equal. It turns out that the number of people in group A is greater than the number of people in group B.
将甲组人数(1/5)拨给乙组，则甲、乙两组人数相等．原来甲组人数比乙组人数多少．
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">5 - 3</gadget>
<output>2</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<result>2/3 = around 0.666667</result>