SOLUTION: Suppose your average, after taking 5 quizzes, is 74 (out of 100). What must your average be on the next 4 quizzes to increase your average to 86 out of 100?
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Question 1145375: Suppose your average, after taking 5 quizzes, is 74 (out of 100). What must your average be on the next 4 quizzes to increase your average to 86 out of 100? Answer by richwmiller(17219) (Show Source):
You can put this solution on YOUR website! (5*74+4x)/9 =86
370+4x=9*86
370+4x=774
4x=774-370
4x=404
x=101
check
(370+404)/9
774/9=86
So you need an average of 101 on the next four quizzes.
Good luck with that
