Mathematics, 15.12.2020 06:50 madiiiiiii69

The mean of a, b,c, and d is 9 and the mean of a, b,c, d,e and f is 12. find the mean of e and f

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The mean of a, b,c, and d is 9 and the mean of a, b,c, d,e and f is 12. find the mean of e and f...