In the table along the columns,
16 + 36 + 38 = 90
49 + 25 + 16 = 90
Sum of numbers along the columns is 90.
Let the required number = a
Similarly from third column,
64 + 6 + a = 90
$$\Rightarrow$$Â a = 20
$$\therefore\ $$The required number = 20
Hence, the correct answer is Option C
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