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6+9= 15
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Sum = 42 Count = 6 Mean = Sum/Count = 42/6 = 7
-23 is the sum of -32 and 9
It is: 3+6 = 9
9 and 6 9-6 = 3 92+62 = 117
The number is 9, because 9 + 2/3(9) is 15, so 9 + 6 = 15 because 2/3 of 9 is 6.