Question
PSLE
The mass of a box with 42 identical balls is 713 g. When 28 of the balls are sold, the mass of the box with the remaining balls is 489 g. What is the mass of each ball?
2 m

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PSLE
The mass of a box with 42 identical balls is 713 g. When 28 of the balls are sold, the mass of the box with the remaining balls is 489 g. What is the mass of each ball?