‌The verdict is this

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Answer: Total= dog + cat= 15
Brand = dog - cat = 11 - 8 = 3 so
Dog= ( 15 + 3 ): 2 = 9
Cat= ( 15 - 3 ): 2 = 6
Mouse= 8 - cat= 8 - 6 = 2
Dog + cat + mouse = 9 + 6 + 2 = 17

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