The average score of a mathematics competition in a certain class is 74 points, among which (4/5) pass, and the average score of the passing students is 80 points, so what is the average score of the failing students?
某班一次数学竞赛的平均分为74分，其中(4/5)及格，及格同学的平均分是80分，那么不及格的同学的平均分是多少分．
<gadget id="calculator">1 * 74</gadget>
<output>74</output>

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

<gadget id="calculator">1 * (4/5) * 80</gadget>
<output>64</output>

<gadget id="calculator">74 - 64</gadget>
<output>10</output>

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

<gadget id="calculator">10 / (1/5)</gadget>
<output>50</output>

<result>50</result>