In a unit test of a certain class, the average score is 80 points, among which (3/4) people pass, the average score is 90 points, what is the average score of those who fail?
某班一次单元测验中，平均分为80分，其中(3/4)的人及格，平均分为90分，不及格的人平均分是多少．
<result>50</result>