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29 December, 22:27

If the average of 12 numbers is 14 and the average of 4 of those numbers is 18, what is the average of the other eight numbers?

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  1. 30 December, 01:29
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    (8 + X + Y) / 3 = 12

    multiply both sides of the equation by 3 to get 8 + X + Y = 36

    subtract 8 from both sides of the equation to get X + Y = 28

    So, the sum of the 2 missing numbers is 28
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