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It seems that   /  symbol  stands for   addition.    Well it cannot be   the divide by  symbol, as then the given equations would be inconsistent.

Cat + Rabbit = 10 kg
Rabbit + Dog = 20 kg
Dog + Cat  = 24  kg

simply add all the equations:   2 (Cat + Dog +Rabbit) = 54 kg

so the answer  is 27 kg

1 5 1
The answer is 24 kgs