Условие:

136 + 5
129 + 8
117 + 9
7 + 78
8020 + 10
903040

136 + 5 = 7 + 5 = 12
129 + 8 = 3 + 8 = 11
117 + 9 = 4 + 9 = 13
7 + 78 = 148 = 6
8020 + 10 = 60 + 10 = 70
903040 = 6040 = 20