In a farm, there are 80 animals. There are Ducks, Flying Fishes, Vultures, Tunas, Pigs, Crocodiles and Swans.

Find the number of Tunas if...

- 45% of the total population of the animals can walk.
- 55% of the total population of the animals can fly.
- The number of the animals that can fly is equal to the animals that can swim.
- The number of Ducks + the number of Crocodiles = the number of Flying Fishes.
- The number of Ducks = the number of Vultures.
- The number of Swans = the number of Flying Fishes.

- 15% of the total population can swim, fly and walk.

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