SOLUTION: Suppose your average, after taking 4 quizzes, is 72 (out of 100). What must your average be on the next 5 quizzes to increase your average to 77 out of 100?

SOLUTION: Suppose your average, after taking 4 quizzes, is 72 (out of 100). What must your average be on the next 5 quizzes to increase your average to 77 out of 100?

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Question 762898: Suppose your average, after taking 4 quizzes, is 72 (out of 100). What must your average be on the next 5 quizzes to increase your average to 77 out of 100?
Answer by tommyt3rd(5050) (Show Source): You can put this solution on YOUR website!
This is a weighted average:

so that x=81

:)
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