Question
A box containing 45 highlighters had a mass of 9.21 kg. A box containing 20 rulers has a mass of 12.21 kg. The mass of each ruler was thrice that of each highlighter. Find the mass of the empty box in grams.
4 m

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A box containing 45 highlighters had a mass of 9.21 kg. A box containing 20 rulers has a mass of 12.21 kg. The mass of each ruler was thrice that of each highlighter. Find the mass of the empty box in grams.