<human>:  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?
<bot>: How many marbles does James have in each bag? ** James has 28 marbles / 4 bags = <<28/4=7>>7 marbles per bag.
How many marbles does James have left? ** James has 28 marbles - 7 marbles = <<28-7=21>>21 marbles remaining.
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