Условие:

8 + 610
9 + 32
1810 + 7
199 + 2
1410 + 8
1610 + 7

8 + 610 = 1410 = 4
9 + 32 = 122 = 10
1810 + 7 = 8 + 7 = 15
199 + 2 = 10 + 2 = 12
1410 + 8 = 4 + 8 = 12
1610 + 7 = 6 + 7 = 13