Question
The total mass of a cat, a rabbit and a dog is 8.1 kg. The rabbit is 0.3 kg heavier than the cat. The dog is 2 times as heavy as the rabbit. Find the mass of the dog.
4 m

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The total mass of a cat, a rabbit and a dog is 8.1 kg. The rabbit is 0.3 kg heavier than the cat. The dog is 2 times as heavy as the rabbit. Find the mass of the dog.