Birds in Trees

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

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

Then the birds of tree B tell to the birds of tree A that if one of you comes here, then our population will be equal to that of yours.

Now answer: How many birds in each tree?

Algebra Puzzle

Kate and her Son's Age


5 years ago Kate was 5 times as old as her Son.

5 years hence her age will be 8 less than three times the corresponding age of her Son.

Find their ages.