The fifth grade carries out dancing and singing competitions. The number of people participating in the competition accounts for (4/5) of the whole grade, among which the number of people participating in the dancing competition accounts for (3/10) of the number participating in the competition, and the number of participating in the singing competition accounts for (4/10) of the participating competition. /5), there are 24 people participating in both competitions, how many students are there in the fifth grade?
五年级开展跳舞和唱歌比赛，参加比赛的人数占全年级的(4/5)，其中参加跳舞比赛的人数占参加比赛人数的(3/10)，参加唱歌比赛的人数占参加比赛的(4/5)，两种比赛都参加的有24人，五年级共有学生多少人．
<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

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

<gadget id="calculator">(4/5) - 1</gadget>
<output>-1/5 = around -0.2</output>

<gadget id="calculator">(3/10) + (-1/5)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">24 / (1/10) / (4/5)</gadget>
<output>300</output>

<result>300</result>