Question
A box containing 40 rulers had a mass of 4.26 kg. A box containing 20 post-it-pads has a mass of 6.26 kg. The mass of each post-it-pad was thrice that of each ruler. Find the mass of the empty box in grams.
4 m

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A box containing 40 rulers had a mass of 4.26 kg. A box containing 20 post-it-pads has a mass of 6.26 kg. The mass of each post-it-pad was thrice that of each ruler. Find the mass of the empty box in grams.