The answer is positive 10
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4*4=16 sum of 1+6 is 7, difference is 5 so 16 is answer
1 + 2 + 3 + 4 + 9 + 10 + 15 + 16 - 5 - 6 - 7 - 8 = 34
4+2+1 = 7
4/7 I guess. 4/7 + 4/7 = 8/7 = 1 1/7. 1 1/7 > 1.
It could be: 4+4+4+4 = 16 and the digital sum of 79 is 7+9 = 16