Question
PSLE
The mass of a box with 55 identical balls is 778 g. When 22 of the balls are sold, the mass of the box with the remaining balls is 470 g. What is the mass of each ball?
2 m

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PSLE
The mass of a box with 55 identical balls is 778 g. When 22 of the balls are sold, the mass of the box with the remaining balls is 470 g. What is the mass of each ball?