During the morning exercises of the sixth grade, boys and girls lined up in a row. Li Ming stood in the queue of boys. He counted and found that the number of people standing in front of him was 4/5 of the total number of people in the row, and the number of people standing behind him is (1/6) of the total number of people in this column. Do you know how many boys there are in the sixth grade?
六年级早操时男女生各排成一列，李明站在男生的队列中，他数了数，发现站在他前面的人数是这一列总人数的(4/5)，站在他后面的人数是这一列总人数的(1/6)．你知道六年级有多少名男生吗？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 - (4/5) - (1/6)</gadget>
<output>1/30 = around 0.033333</output>

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

<result>30</result>