The ratio of the number of girls to the number of boys in the first grade is 2:3. After transferring to 5 girls, the boys accounted for the total number of first grade (6/11). How many male students were there in the first grade?
一年级女生人数和男生人数之比为2：3转入5名女生后，男生占一年级总人数的(6/11)，一年级原来有男学生多少人．
<gadget id="calculator">11 - 6</gadget>
<output>5</output>

<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

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

<gadget id="calculator">(5/6) - (2/3)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">5 / (1/6)</gadget>
<output>30</output>

<result>30</result>