Question
A box filled with 8 identical marbles weighs 1290 g. The same box when filled with 7 identical balls weighs 490 g. The mass of each marble is four times the mass of each ball. What is the mass of the box?
4 m

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A box filled with 8 identical marbles weighs 1290 g. The same box when filled with 7 identical balls weighs 490 g. The mass of each marble is four times the mass of each ball. What is the mass of the box?