$\begin{matrix} 162 & (16) & 94 226 & (. . . .) & 215 \end{matrix}$

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Solution

The correct option is B 21
Square root of the number obtained by adding the numbers in first and third columns gives the number in second column.
Thus, $\sqrt{162 + 94} = \sqrt{256} = 16$
The missing number is: $\sqrt{226 + 215} = \sqrt{441} = 21$

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