From the first column,
5 x 2 = 10
5 + 2 = 7
From the second column,
6 x 3 = 18
6 + 3 = 9
From the third column,
7 x 3 = 21
7 + 3 = 10
Similarly from the fourth column,
8 x 5 = 40
8 + 5 = 13
$$\therefore\ $$The required number = 13
Hence, the correct answer is Option A
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