SOLUTION: A student wants to know what the grade he needs to make on the final exam to have a grade of 80% in his course. His grade on the first exam was 65%, second exam was 85%, and the th

Algebra ->  Average -> SOLUTION: A student wants to know what the grade he needs to make on the final exam to have a grade of 80% in his course. His grade on the first exam was 65%, second exam was 85%, and the th      Log On


   

Question 337509: A student wants to know what the grade he needs to make on the final exam to have a grade of 80% in his course. His grade on the first exam was 65%, second exam was 85%, and the third 77%. the first three exams are each worth 20% of the overall grade with the final exam worth 40%. What grade does he need to make on the final exam to have a grade of 80% on the course?
Answer by benazir.sj@gmail.com(109) About Me  (Show Source):
You can put this solution on YOUR website!
Grade for first eaxm =65%
grade for second exam = 85%
grade for third exam =77%
overall grade =20%
grade for final exam =x
overall grade = 40%
total grade =80%
(65% +85% 77%)20% +x*40% =80%
227% *20% +x*40%=80%
45.4% +40x% =80%
40x% =80%-45.4%
40x% = 34.6%
x% = 34.6%/40%
x%= 0.865
x=86.5%
grade score for final exam =86.5%