Question

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 come 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 come here, then our population will be equal to that of yours. Q. How many birds in each tree?

Answer 1

Answer:

7 birds in tree A. 5 birds in tree B.