Mathematics

Mathematics, 24.01.2020 02:31, abby2572

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 a...

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