It really depends. If the question gives you a frame of reference, say, A-20=b, that narrows it down a little. See you can try to find #'s and see if it works. Lets try 42 for A. If A-20=B, and A=42, it would be: 42-20=B 42-20=22.
Then it would be, So A is 42 and B is 22. 42+22=20.
If you don't have a frame of reference however, it could be any 2 #'s.
0+64
1+63
2+62
3+61
4+60...
The list goes until you have the same #.
32+32.
Then anything else is just a repeat but backwards.
THANKS HOPE IT HELPED!!!
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