Question

Find the missing term :

2	10	11	15
9	8	5	20
7	9	?	10
6	9	11	15

• A. $17$
• B. $20$
• C. $15$
• D. $21$

Answer 1

The correct option is D $21$

Here we consider the sum of the elements for every column.

In the first column, we have $2+9+7+6=24$ which can be written as $12\times 2=24$.

In the second column, we have $10+8+9+9=36$ which can be written as $12\times 3$.

In the last column, we have sum as $60$ which can be written as $12\times 5$.

Here, the sum is nothing but a number multiplied by $12$.

Hence, in the third column sum must be equal to $12\times 4=48$.

Hence, sum must be $48$.

To get the sum as $48$, the required number in the third column is $21$.

Hence, option D is the correct answer.