Solution
45@23 $$\rightarrow$$ (4 + 2) + (5 + 3 )=14,
76@22 $$\rightarrow$$(7 + 2) + (6 + 2) = 17
Similarly,
55@10 $$\rightarrow$$ (5 + 1) + (5 + 0) = 11
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