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Thorak

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Question

If it is true, that ... 
 
2 +2 = 4 
5 +5 = 0 
8 +8 = 6 
21 +24 = 2 
 
...add what is true in the next examples: 
 
8 +12 =? 
3 +8 =? 
100 +20 =? 
25 +5 =? 
99 +2002 =? 
 
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2 answers to this question

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8 + 12 = 0


3 + 8 = 1
100 + 20 = 9 or -11?
25 + 5 = 8 or -2
99 + 2002 = 2 or -208

Let x = mathematically "correct" answer...then the answers above come from:

if x < 10, then x...
else (x % 10 - (FLOOR(x / 10) - 1))
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