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Today, 14:46

Suppose your average, after taking 4 quizzes, is 73 (out of 100). What must your average be on the next 5 quizzes to increase your average to 88 out of 100?

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  1. Today, 17:00
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    x = average of next 5 quizzes

    4 * 73 = first 4 quizzes

    There will be a total of 4 + 5 = 9 quizzes

    Average of all quizzes = 88 = (4*73+5x) / 9

    9*88 = 9 * (292 + 5x) / 9

    792 = 292 + 5x

    500 = 5x

    X = 500/5 = 100

    Next 5 quizzes need to average 100
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