20 because 26+14+20 = 60 and 60/3 = 20
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The average is 20.
20 = (14 + 26 + 16 + 24) / 4
It is: (14+38)/2 = 26
(14+26)/2 = 20
The pattern is subtract 9, add 3. 26-9 = 17 17+3 = 20 20-9 = 11 11+3 = 14 14-9 = 5 So, 5 +3 = 8