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-9 + 12 = 3
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12+5+9+10=36/4=9 9 is the Mean of 12, 5, 9, and 10 To find the mean of something, add all the figures and then divide by the number of figures.
It is: 1/3 plus 9/12 = 13/12 or 1 and 1/12 as a mixed number