Answer:
The answer is 3 birds.
Explanation:
This is a trial and error question. If you have 1 bird and 8 cats, the total amount of money is ($3 x 1 bird)+($7 x 8 cats.) This equals $3+$56=$59. This is too much money. If you have 2 birds and 7 cats, the total amount of money is ($3 x 2 birds)+($7 x 7 cats.) This equals $6+$49=$55. This is too much money. If you have 3 birds and 6 cats, the total amount of money is ($3 x 3 birds)+($7 x 6 cats.) This equals $9+$42=$51. This is your answer. I hope this helps and that you have a great day!!