SOLUTION: Suppose your average, after taking 3 quizzes, is 76 (out of 100). What must your average be on the next 5 quizzes to increase your average to 81 out of 100

Algebra ->  Problems-with-consecutive-odd-even-integers -> SOLUTION: Suppose your average, after taking 3 quizzes, is 76 (out of 100). What must your average be on the next 5 quizzes to increase your average to 81 out of 100      Log On


   

Question 885380: Suppose your average, after taking 3 quizzes, is 76 (out of 100). What must your average be on the next 5 quizzes to increase your average to 81 out of 100
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
Suppose your average, after taking 3 quizzes, is 76 (out of 100).
What must your average be on the next 5 quizzes to increase your average to 81 out of 100
:
let a = the average of the next 5 quizzes
:
%283%2876%29%2B5a%29%2F8 = 81
228 + 5a = 81 * 8
5a = 648 - 228
5a = 420
a = 420/5
a = 84 av on the last 5 quizzes