The sum of -18 and 39 is 21.
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39.
14, 16, 18 and 16, 18, 20
The GCF in this case is 3. 75 + 18 = 93 93/3 = 31 Rewriting 31 as another sum seems unnecessary, but sure. (30+1) * 3 = 93 = 75 + 18.
The 3rd magic sum in the 39 clues game is 42.
sum = 138 sample size = 7 138 / 7 ~= 19.714285714285715