SOLUTION: a student scores 75 and 85 on 2 exams each of which count for 40% of the couse grade. the final exam counts for 20% of the course grade. what score must she get in order to have a

Algebra ->  Percentage-and-ratio-word-problems -> SOLUTION: a student scores 75 and 85 on 2 exams each of which count for 40% of the couse grade. the final exam counts for 20% of the course grade. what score must she get in order to have a       Log On


   

Question 386356: a student scores 75 and 85 on 2 exams each of which count for 40% of the couse grade. the final exam counts for 20% of the course grade. what score must she get in order to have a average grade of 78%
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
0.4*75 + 0.4*85 + 0.2*x = 78;
64 + 0.2x = 78;
0.2x = 14;
x = 70, the score she must get.