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Birds in Trees Puzzle
The Puzzle:
There are 2 trees in a garden (called "Angel" and "Black") and in both trees are some birds.
The birds of Angel tree say to the birds of Black tree that if one of you comes to our tree, then our population will be double yours.
Then the birds of Black tell the birds of Angel that if one of you comes here, then our population will be equal to yours.
How many birds in each tree?
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