There are 104 students in three classes A, B, and C, among which the number of students in class A is more than that of class B (2/5), and the number of people in class A (1/7) is 2 less than the number of people in class B (1/4) people. So how many students are there in Class C?
甲、乙、丙3个班共有104名同学，其中甲班的人数比乙班多(2/5)，并且甲班人数的(1/7)比乙班人数的(1/4)少2人．那么丙班有多少名同学？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 + (2/5)</gadget>
<output>7/5 = around 1.4</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">(2/5) * (1/7)</gadget>
<output>2/35 = around 0.057143</output>

<gadget id="calculator">(1/4) - (1/7) - (2/35)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">2 / (1/20)</gadget>
<output>40</output>

<gadget id="calculator">(7/5) * 40</gadget>
<output>56</output>

<gadget id="calculator">104 - 56 - 40</gadget>
<output>8</output>

<result>8</result>