answer.
- 60 + 30 = 90- 60 + 30 = 90
 90 +7 + 8 = 15 13 = 105
 - 60 + 30 = 90
 90 +7 + 8 = 15 13 = 105
7 + 8 = 15     
- 80 + 30 = 110
5 + 7 = 13 
110 + 13 
 122
80 + 10 = 90 
3 + 9 = 12 = 90 + 12 = 102 
80 + 10 = 90 
3 + 9 = 12 = 90 + 12 = 102 
 
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