If 52 @ 15 = 15' and 38 @ 26 = 25', then 45 @ 31 = ?'. What will come in place of question mark?
52 x 15 = 780; 7 + 8 + 0 = 15 38 x 26 = 988; 9 + 8 + 8 = 25 45 x 31 = 1395; 1 + 3 + 9 + 5 = 18
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