Boxes
In a white box there are only white balls, in a green box there are only green balls, and in a blue box there are only blue balls. There are 12 white balls and 60 blue ones. Into the white box we transfer from the green and from the blue boxes such a number of balls that all three boxes have the same number of balls. From the green box we thus have to take 9 more balls than from the blue box. Determine the number of green balls?
Final Answer:

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