If 1/5 of the number of people in class A is transferred to class B, the number of people in the two classes will be equal. How much more people in class A than in class B
把甲班人数的(1/5)调入乙班，则两班人数相等，原来甲班人数比乙班人数多多少
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5) - (1/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">2 / (3/5)</gadget>
<output>10/3 = around 3.333333</output>

<gadget id="calculator">(1/5) * (10/3)</gadget>
<output>2/3 = around 0.666667</output>

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