英语翻译Fred's final mark in an online course was determined ent

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英语翻译
Fred's final mark in an online course was determined entirely by two exams.The mid-term exam was out of x marks and was worth 25% of his final mark.The final exam was out of 2x marks and was worth 75% of his final mark.Fred scored 40 marks on the first exam and 60 marks on the second exam .Determine the value of x if Fres earned a final mark of 50% in the course.
求题目翻译,

Fred某门课的总分由两个考试决定.期中考试满分为x,占总分的25%,期末考试满分是2x,占总分的75%.Fred期中考试拿了40分,期末拿了60分.如果Fred这门课总成绩为50的话,求x是多少
P.S. 楼上像拿google翻译的做的.

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