Number Puzzle: Use simple logic to find the missing number

Missing number puzzle

In the above image, one number is missing. Can you find the missing number using simple logic. This type of problems are very common in competitive examinations.

The missing number is 10
Explanation:
First Shape: (3*2+4*2)-(6/3+12/3)=8
Second Shape: (2*2+5*2)-(18/3+3/3)=7
Third Shape: (6*2+4*2)-(24/3+6/3)=10

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