missing numbers math puzzle answer

The answer to this puzzle is 3 as explained below

Count 3 numbers adjacent to the missing number 6 + 7 + 8 = 21 add 2 + 1 = 3 In the same manner 2+ 1 + 12 = 15 add 1 + 5 = 6 , 11 + 10 + 9 = 30 add 3 + 0 = 3 and lastly 5 + 4 + 3 = 12 add 1 + 2 = 3

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