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1, 2, and 4
-12+28 = 16
It is the middle value of: 12 16 28 76 and 89 which is 28
28
12.
16 + 12 = 28
16 (16+12=28)
16 and 12
16+12=28
Simply add the two numbers. 28 is 12 more than 16.
20+8, DUH!
12 and 16