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What is the missing number?

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12 (?)

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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!

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Reason for giving 12:

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(15-6)*6=54

(12-10)*10=20

(12-8)*8=32

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

Reason for giving 12:

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(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

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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 by rocdocmac
Moved to spoiler

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