Answer: Option A. -> 20
Working from top to bottom,
The sum of the numbers in each row is put in the left hand box on the row below, and the difference between the two numbers in each row is put in the right hand box on the row below. I.e.
Row one First Element + Row one second element = Row two first Element.
Difference of first row elements = Row two second Element.
And So on.
Thus,
Row fifth first element + row fifth second element = Row sixth first element
32 + 12 = 44
And,
32 - 12 = 20 ( Row sixth second element).

Answer: Option D. -> 11
Logic (Column-wise):
First Element + 4 = Second Element
Second Element + 6 = Third Element.
3 + 4 = 7 +6 = 13
5 +4 = 9 + 6 = 15
So,
1 + 4 = 5 + 6 = 11.
Missing Number= 11.

Answer: Option B. -> 4
Logic:
Sum of First Diagonal Element = Sum of Second Diagonal Elements.
5 + 12 + x = 7 + 12 + 2
17 +x = 21
x = 4.
Missing Number = 4

Answer: Option D. -> 6
Moving left to right, numbers represent the reverse alphabetical values of the 5 vowels. So,
At missing place, the last vowel U will come. I.e.
Alphabetical order = 21 and reverse of this would be 6.

Answer: Option B. -> 6
Starting with the numbers in the top row, left to right, multiply each one by 2 and write the results in the lower row, from right to left. So,
Missing Element = 3 * 2 = 6.

Answer: Option D. -> 25
Logic:
(First Number/2) + Second Number = Third Number.
12/2 + 8 = 14
8/2 + 14 = 18
14/2 + 18 = 25.
So, Required Number = 25.

Answer: Option D. -> 2
In each diagram, multiply the numbers shown on the arms together and add the number at the very top to give a 2 digit result, written in the lower 2 spaces. So,
50 = 6 * 8 + x.
x = 2.

Answer: Option D. -> 19
Divide bigger square in four smaller square. Then,
Central Number of each smaller square = sum of the each number at Corner.
So,
14 + 3 + x + 11 = 47.
x = 19.

Answer: Option C. -> 9
Using the top two grids as a source, numbers in the lower left grid equal the sums of numbers in corresponding positions of the top two grids, subtracting 1 each time, and numbers in the lower right grid equal the differences between numbers in corresponding positions of the top two grids, adding 1 each time.

Answer: Option A. -> 4
The average of the numbers in each column is always 4. So,
Missing Element = 4.