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Correct answer: 4

Explanation:

Compare the numbers in the same colored sections of the circles.

The number in the right circle is made by multiplying the matching colored number from the left circle by the matching colored number from the bottom circle.

For the red section: 4 × 3 = 12

For the blue section: 5 × 8 = 40

So for the green section: 11 × ? = 44

Now solve: 44 ÷ 11 = 4

Therefore, the missing number is 4.

Finall answer to this puzzle: 4