Question
PSLE
The mass of a box with 58 identical marbles is 778 g. When 30 of the marbles are set aside, the mass of the box with the remaining marbles is 388 g. What is the mass of each marble?
2 m

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PSLE
The mass of a box with 58 identical marbles is 778 g. When 30 of the marbles are set aside, the mass of the box with the remaining marbles is 388 g. What is the mass of each marble?