Question
A container filled with 4 identical marbles weighs 1140 g. The same container when filled with 6 identical balls weighs 780 g. The mass of each marble is three times the mass of each ball. What is the mass of the container?
4 m

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A container filled with 4 identical marbles weighs 1140 g. The same container when filled with 6 identical balls weighs 780 g. The mass of each marble is three times the mass of each ball. What is the mass of the container?