What is the missing number?

[Roxane 0]

(copied from www.games4brain.com)

[rocdocmac 3]

Spoiler

12 (?)

 

[Roxane 0]

No, it is not 12. Just to give a hint: you should think of the digits (not numbers) in the left and right columns. Hope it helps!

[rocdocmac 3]

Reason for giving 12:

Spoiler

(15-6)*6=54

(12-10)*10=20

(12-8)*8=32

 

Edited December 24, 2017 by rocdocmac
spoiler

[Roxane 0]

On 12/24/2017 at 1:01 PM, rocdocmac said:

Reason for giving 12:

  Hide contents

(15-6)*6=54

(12-10)*10=20

(12-8)*8=32

 

Yeap, it seems it works. But still, this is not what expected. Try adding the digits of columns 1 & 3

[rocdocmac 3]

 

Spoiler

row 1:   6 (left) & 54 (right) ... 6 + 5 + 4 =15 (middle)

row 3:   12 (left) & 32 (right) ... 1 + 2 + 3 + 2 = 8 (middle)

Therefore, row 2:   10 (left) & 20 (right) ... 1 + 0 + 2 + 0 = 3 (middle)

 

Edited December 27, 2017 by rocdocmac
Moved to spoiler