What is the missing number?
6+4=210
9+2=711
8+5=313
5+2=37
7+6=113
9+8=117
10+6=416
15+3=?
Solution:
6+4=210, 6-4=2 & 6+4=10. Therefore 6+4=210
9+2=711, 9-2=7 & 9+2=11. Therefore 9+2=711
15+3=?, 15-3=12 & 15+3=18. Therefore 15+3=1218
Answer: 1218
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