Multiple choice general knowledge math & puzzles

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?

  1. 7 - Tree B, 5 - Tree A

  2. 5 - Tree B, 7 - Tree A

  3. None of above

  4. Both are correct
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

If Tree A has 7 and Tree B has 5: (7+1) = 2*(5-1) => 8 = 8 (True). If (5+1) = (7-1) => 6 = 6 (True). Thus, Tree A has 7 and Tree B has 5.

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