Question
A box containing 40 folders had a mass of 2.61 kg. A box containing 15 files has a mass of 3.81 kg. The mass of each file was four times that of each folder. Find the mass of the empty box in grams.
4 m

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A box containing 40 folders had a mass of 2.61 kg. A box containing 15 files has a mass of 3.81 kg. The mass of each file was four times that of each folder. Find the mass of the empty box in grams.