The school held a singing competition. The number of participants in the sixth grade accounted for 4/7 of the sixth grade students. Later, 2 people participated in the competition. At this time, the ratio of the number of participants to the number of non-participants was 3:2. How many students are there in the sixth grade?
学校举行歌咏比赛，六年级参加人数占六年级人数的(4/7)，后来又有2人参加比赛，这时参加人数与未参加人数的比是3：2，六年级有学生多少人？
<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">(3/5) - (4/7)</gadget>
<output>1/35 = around 0.028571</output>

<gadget id="calculator">2 / (1/35)</gadget>
<output>70</output>

<result>70</result>