What number should replace the question mark? 19 9 17
23 12 25
13 ? 31
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Given,
The arrangement of the numbers is :
19 9 17
23 12 25
13 ? 31
To find,
The number which will be at the position of question mark.
Solution,
We can simply solve this mathematical problem by using the following mathematical process.
First of all, we will have to find out the relation between three numbers of each row.
Mathematical relationship :
1) Row 1 :
Numbers at both end = 19,17
Their sum = 19+17 = 36
Division by 4 = 36/4 = 9 = Middle number
2) Similarly for Row 2 :
Sum of numbers at both end = (23+25) = 48
Division by 4 = 48/4 = 12 = Middle number
3) So, for Row 3 :
Sum of numbers at both end = (13+31) = 44
Middle number = Sum of end numbers/4 = 44/4 = 11
Hence, the missing number is 11
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