How many birds were sitting on the tree ‘A’ and tree ‘B’ respectively?
Some birds are sitting on tree ‘A’ and some birds are sitting on tree ‘B’. If one bird from tree ‘A’ went on tree ‘B’ then the number of birds on tree ‘B’ will be twice the number of birds on tree ‘A’ and if one bird from tree ‘B’ will go on tree ‘A’ then the number of birds on both the trees will be equal. Now initially how many birds were sitting on tree ‘A’ and tree ‘B’ respectively?