The number of people in the second class of six years is equal to the number of people in the second class of six years after being transferred out (1/5). How much is the number of people in the second class of six years?
把六年一班的人调出(1/5)后刚好与六年二班人数相等，原来六年二班人数是六年一班的多少
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>