Question

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Answer 1

according to the question the given two no.'s sum is added with the previous sum of the two number. So the last blank answer is 40.Hope it is correct it helps u.
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Answer 2

$\textbf{\underline{\underline{Answer :-}}}$

$\textbf{The value of ? is 40}$

$\textbf{\underline{\underline{The Logic :-}}}$

The answer of the previous Equation is added to the next Equation to get the answer given.

$\textbf{\underline{\underline{Explanation :-}}}$

$\tt{\implies{1 + 4 = 5}}$

The number '5' will be added to the next equation :

$\tt{\implies 5 + {\rightarrow2 + 5 = 12}}$

$\tt{\rightarrow7 + 5 = 12}$

$\tt{\rightarrow12 = 12}$

Now, 12 will be added to next :

$\tt{\implies12 + {\rightarrow3 + 6 = 21}}$

$\tt{{\rightarrow12 + 6 = 21}}$

$\tt{\rightarrow21 = 21}$

21 will be added to the next Equation :

$\tt{\implies21 + {\rightarrow8 + 11 = }}$

$\tt{\rightarrow29 + 11}$

$\tt{\rightarrow40}$

$\boxed{\tt{Question \: mark \: = 40}}$

$\therefore$$\textbf{The value of ? is 40}$