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14 January, 17:00

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

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  1. 14 January, 19:49
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    (76 + 76 + 76 + 5x) / 8 = 81

    (228 + 5x) / 8 = 81

    228 + 5x = 81 * 8

    228 + 5x = 648

    5x = 648 - 228

    5x = 420

    x = 420/5

    x = 84 <===
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