Question

What number should replace the question mark in the grid?

Answer 1

2+3=1+4=5 .....

Answer 2

Answer: 5

Each number appearing in the far left column is the sum of the number of the last two columns appearing in the same row (ex. Top Row is 64251 5+1=6, Second Row is 83544 4+4=8, and so on)

Answer 3

In each row the first no is the sum of remaining nos divided by 2
I.e., 6=(4+2+5+1)/2
8=(3+5+4+4)/2
So. ?=(2+3+1+4)/2=5.

Answer 4

5
the difference b /w first column and 3rd column elkements is second column
hence x-2=3
x=5

Answer 5

68-43 = 25, 68-54 = 14
83-30 = 53, 83-42 = 41
39-01 = 38, 39-22 = 17
9* -12 = 83, 9*-21=74
* = 5