SOLUTION: On four exams Bobs grades were 79, 93, 91, and 68. What grade must he obtain on his fifth exam to have an average of 80?

Question 822779: On four exams Bobs grades were 79, 93, 91, and 68. What grade must he obtain on his fifth exam to have an average of 80?
Found 2 solutions by oscargut, rfer:
Answer by oscargut(2103) (Show Source): You can put this solution on YOUR website!
we need to find x where
(79+93+91+68+x)/5 = 80
331+x = 400
x = 69
Answer 69
You can ask me more at : mthman@gmail.com
Thanks

Answer by rfer(16322) (Show Source): You can put this solution on YOUR website!
(79+93+91+68+x)/5=80
331+x=80*5
x=400-331
x=69
RELATED QUESTIONS
If my exam grades are 79, 93, 91, and 68, what grade would I need on my next exam to have (answered by jim_thompson5910)
Suppose your grades on three english exams are 80, 93, and 91. What grade do you need on (answered by josmiceli)
Candace had scores of 103, 89, 99, and 93 on her first four exams of the semester. What... (answered by ewatrrr)
Tom scored 75, 78, 87, 81 and 76 on five exams. What grade must Tom obtain on his sixth... (answered by stanbon,nerdybill)
An average grade of 80 on all exams in a course is needed to earn a B in the course. On... (answered by josgarithmetic,ikleyn,greenestamps)
Tommy Recieved a 96 and an 80 his past two algebra 2 exams. If all exams are equally... (answered by Boreal)
You receive grades of 89, 79, 82, 91, and 92 on your last five math exams. What grade... (answered by srinivas.g)
Margarita received grades of 79%, 86%, 92%, and 83% on his first four... (answered by rapaljer)