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The mean of 4 numbers is 5 and the mean of 3 different numbers is 12. What is the mean of the 7 numbers together? Produce an algebraic solution. Guess and check is acceptable.

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Answer to a math question The mean of 4 numbers is 5 and the mean of 3 different numbers is 12. What is the mean of the 7 numbers together? Produce an algebraic solution. Guess and check is acceptable.

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Velda
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Total sum of the 4 numbers: 4\times5=20 Total sum of the 3 numbers: 3\times12=36 Total sum of the 7 numbers: 20+36=56 Mean of the 7 numbers: 56\div7=8

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