Question
PSLE
The mass of a box with 57 identical balls is 922 g. When 30 of the balls are used, the mass of the box with the remaining balls is 502 g. What is the mass of each ball?
2 m

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PSLE
The mass of a box with 57 identical balls is 922 g. When 30 of the balls are used, the mass of the box with the remaining balls is 502 g. What is the mass of each ball?