Question
The total mass of a mouse, a kitten and a puppy is 6.4 kg. The kitten is 0.4 kg heavier than the mouse. The puppy is 2 times as heavy as the kitten. Find the mass of the puppy.
4 m

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The total mass of a mouse, a kitten and a puppy is 6.4 kg. The kitten is 0.4 kg heavier than the mouse. The puppy is 2 times as heavy as the kitten. Find the mass of the puppy.