Question
A box filled with 8 identical marbles weighs 1300 g. The same box when filled with 3 identical beads weighs 780 g. The mass of each marble is two times the mass of each bead. What is the mass of the box?
4 m

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A box filled with 8 identical marbles weighs 1300 g. The same box when filled with 3 identical beads weighs 780 g. The mass of each marble is two times the mass of each bead. What is the mass of the box?