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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105 Answers

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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