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18 January, 14:20

The average of the first 8 numbers is 6. The average of the next 12 is 11. What is the overall average of the 20 numbers?

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  1. 18 January, 15:40
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    X / 8 = 6

    x = 48

    y / 12 = 11

    y = 132

    Total of the 20 numbers = 48 + 132 = 180

    Average of these 20 = 180 / 20

    = 9
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