Question
A box containing 45 files had a mass of 4 kg. A box containing 15 folders has a mass of 5.2 kg. The mass of each folder was four times that of each file. Find the mass of the empty box in grams.
4 m

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A box containing 45 files had a mass of 4 kg. A box containing 15 folders has a mass of 5.2 kg. The mass of each folder was four times that of each file. Find the mass of the empty box in grams.