James has 28 marbles. He puts them into 4 bags. He puts the same number in each bag. He then gives one bag away. How many marbles does James have left? Let's think first. Chain of thought:
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James has 28 marbles / 4 bags = 7 marbles per bag. James has 28 marbles - 7 marbles = 21 marbles remaining.
Therefore, the answer is 21.
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