Question
A box containing 40 notebooks had a mass of 3.43 kg. A box containing 30 files has a mass of 5.03 kg. The mass of each file was twice that of each notebook. Find the mass of the empty box in grams.
4 m

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A box containing 40 notebooks had a mass of 3.43 kg. A box containing 30 files has a mass of 5.03 kg. The mass of each file was twice that of each notebook. Find the mass of the empty box in grams.