Question
PSLE
The mass of a box with 40 identical balls is 726 g. When 21 of the balls are taken out, the mass of the box with the remaining balls is 306 g. What is the mass of each ball?
2 m

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PSLE
The mass of a box with 40 identical balls is 726 g. When 21 of the balls are taken out, the mass of the box with the remaining balls is 306 g. What is the mass of each ball?