Question
A box containing 45 rulers had a mass of 3.12 kg. A box containing 20 staplers has a mass of 3.87 kg. The mass of each stapler was thrice that of each ruler. Find the mass of the empty box in grams.
4 m

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A box containing 45 rulers had a mass of 3.12 kg. A box containing 20 staplers has a mass of 3.87 kg. The mass of each stapler was thrice that of each ruler. Find the mass of the empty box in grams.