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Image 1 hint
The answer is 49.
What is the question?
Why does it work?
Image 2 hint
The answer is 42.
What is the question?
Why does it work?
Image 3 hint
The answer is 63.
What is the question?
Why does it work?
Image 4 Hint
The answer is 56.
What is the question?
Why does it work?
See also this problem .