Tree Y

Algebra Level 3

There are 2 trees in a garden (tree "X" and "Y") and on the both trees are some birds.

The birds of tree X say to the birds of tree Y that if one of you comes to our tree, then our population will be the double of yours.

In response, the birds of tree Y say to the birds of tree X that if one of you comes here, then our population will be equal to that of yours.

How many birds there in tree Y?

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