Missing Number Finding - General Inteligence & Reasoning MCQ Questions and Answers

First Row,
Middle Digit = First Element + Last Element + 2
11 = 7 + 2 + 2
Second Row,
14 = 6 + 4 + 4
Third Row,
19 = 5 + x + 6
So,
x = 8.

8
8 + 4 = 12
12 + 5 = 17
17 + 6 = 23
23 + 7 = 30
30 + 8 = 38.

Logic (Row-wise):
Right hand element = Sum of the odd numbers in the row

4 = 3 + 1
7 = 7
8 = 5 + 3
So,
x = 0
Because there is no odd number in the last row.

Logic (Column-wise):
Sum of the element in each column = 21.
So,
6 + 12 + x = 2.
x = 3.

Add the number at each corner of the diagram to its 2 adjacent numbers. The total is always 15.

4 + 4 + 7 = 15
5 + 4 + 6 = 15
6 + 7 + 2 = 15
So,

6 + 2 + x = 15
x = 15 - 8 = 7.

As you move to the right, double the first number to give the next one, then subtract 5. Repeat this sequence.
8
8 *2 = 16
16 - 5 = 11
11 * 2 = 22
Now,
22 - 5 = 17.
Missing number = 17.

Numbers in the segments of the upper left hand circle equal the product of the numbers in corresponding segments of the lower 2 circles, and the numbers in the segments of the upper right hand circle equal the sum of the numbers in corresponding segments of the bottom two circles.

Working from the bottom row to the apex of the triangle, the sum of the values in each row follows the sequence 15, 14, 13,12.

8 + 2 + 1 + 4 = 15
7 + 3 + 4 = 14
6 +7 = 13
So,
Top Element = 12.

Row-wise:
7 +2 + 6 = 15
3 + 9 + 3 = 15
So,
5 + 4 + x = 15
x = 6.

Logic:
Next number ( Even Placed ) = Previous Number + Sum of the digits of previous number.
Next number ( Odd Placed ) = Previous Number + Sum of the digits of previous number - 12.

79 = 71 + 7 + 1 ( Even Placed )
67 = 79 + 7 + 9 -12 ( Odd Placed )
80 = 67 + 6 +7 ( Even Placed )
68 = 80 + 8 + 0 - 12( Odd Placed )
x = 68 + 6 + 8 = 82( Even Placed )
Thus, Missing number = 82.