Problema Solution
suppose your average after taking 3 quizzes is 72 out of 100. What must your average be on thenext 6 quizzes to increase your average to 84 out of 100?
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Solution:
x = average of the next 6 quizzes
(6x + 3(72))/9 = 84
6x + 216 = 756
6x = 540
x = 90