After transferring (1/7) the students from Class 1, Grade 6 to Class 2, it happens to be equal to the number of Class 2, Grade 6. It turns out that the number of Class 2, Grade 6 is the number of Class 1, Grade 6
把六年级一班的人调出(1/7)到二班后，刚好与六年级二班的人数相等，原来六年级二班的人数是六年级一班人数的多少
<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">(1/7) * 2</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">1 - (2/7)</gadget>
<output>5/7 = around 0.714286</output>

<result>5/7 = around 0.714286</result>