SOLUTION: after taking 4 quizzes, your average is 77 out of 100. what must your average score be on the next five quizzes to increase your average to 82. I tried 83 because if you mu

Question 622969: after taking 4 quizzes, your average is 77 out of 100. what must your average score be on the next five quizzes to increase your average to 82.
I tried 83 because if you multiply by 5 then add 77 divide it by 6 it equals 82. But as you can tell i got it wrong. Thanks for your time
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
after taking 4 quizzes, your average is 77 out of 100. what must your average score be on the next five quizzes to increase your average to 82.
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82 = (4*77 + 5*Avg5)/(4 + 5)
(308 + 5*Avg5)/9 = 82
308 + 5Avg5 = 738
5Avg5 = 430
Avg5 = 86
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