Tina Has Some Parrots And Some Cages For The Parrots

Tina has some parrots and some cages for the parrots.
If she put 4 parrots into each cage then she will have one cage left.
If she put 3 parrots into each cage then she will have one parrot left over.
How many parrots and cages does she have?

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16 Parrots & 5 Cages