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27 February, 17:15

What number must be added to 15 - 6 and 12 to have a mean of five

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  1. 27 February, 17:39
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    -1 must be added.

    15 + (-6) + 12=21. If you add one more number, then you would have to divide the sum by 4 to get the mean. 5*4=20. To get to 20, you have to add - 1.
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