71 :D
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71 is not a multiple of 9, but 27, 54, and 72 are multiples of 9.
169
Mean: 71 Median: 67.5 Mode: None Range: 28
At each step the number being subtracted is reduced by 9 298 - 89 = 209 209 - 80 = 129 129 - 71 = 58 58 - 62 = -4 -4 - 53 = -57..........which is the next number.
78