Question

Fill in the blank

$\begin{array}{ccc}123& \left(68\right)& 314\\ 512& (....)& 405\end{array}$

• A. $58$
• B. $79$
• C. $46$
• D. $89$

Answer 1

The correct option is D $89$

Sum of digits of number in first column is the first digit of the number in second column and sum of digits of number in third column is the second digit in second column.
Thus, $1+2+3=6$, $3+1+4=8$
Hence, the missing number is:
$5+1+2=8$ and $4+0+5=9$, the missing number is 89