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% fo 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 fir

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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% fo 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 fir
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% fo 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 Fred earned a final mark of 50% in the course.

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% fo 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 fir
由题,可列方程
(40/x) ×0.25 + [60/(2x)]×0.75 =0.5
即,(10/x) + (22.5/x) =0.5
32.5/x =0.5
解得,x=32.5/0.5=65
so,the value of x is 65

(40/x)·0.25+(60/2x)·0.75=50%
解x就可以了

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% fo 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 fir FRED'S fred jumps the highest in his class同义句转换_______ ________ in Fred's class jumps _______ ________ Fred Mark Twain’s Works in China 英译汉 how he wants to get a high mark in the final termexamination的答语 fred 阅读并判断正误 题1.Tom and Fred are brothers.2.Tom and Fred are students.3.Tom's parents are in No.106 Middle School.4.Tom's parents are teachers.5.Fred's parents aren't in No.105 Middle School.文Tom and Fred from America.They are now in Chi there is a lot of money in Mark's w_____ mark one`s st mark's cathedral the events to mark the president's ten years in office went ahead as planned是什么意思特别是mark这是什么意思 Ted is big,Mark is bigger than Ted,Fred is bigger than Mark合并为一句 谁帮我解一道英文的数学题the ratio of Stan`s age to Fred`s age is 7:12.in 3 year time,their total age will be 101.what is Fred age 17 years from now Final qty in master 1、This dictionary is 【Tina's】 (方括号部分提问)2、How much did they spend in building the new lab?(改为被动句)3、Fred runs fastest in his class.Fred runs faster than ____ ____ in his class.Fred runs faster than ____ ____ ____ Mark Twain's funny story made everyone in the room laugh.改成被动语态 Mark's shoes are (in the box )对括号部分进行提问 It's my final project.