Question
PSLE
The mass of a container with 42 identical marbles is 779 g. When 30 of the marbles are given away, the mass of the container with the remaining marbles is 449 g. What is the mass of each marble?
2 m

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PSLE
The mass of a container with 42 identical marbles is 779 g. When 30 of the marbles are given away, the mass of the container with the remaining marbles is 449 g. What is the mass of each marble?