human
At least a third of Fred's marbles are dark blue. All of the rest are red, except for 4 that are green. If he has 63 marbles, how many of them are red?
assistant
How many dark blue marbles does Fred have? ** Fred has 63/3 = <<63/3=21>>21 dark blue marbles.
How many red and green marbles does Fred have? ** Fred has 63-21 = <<63-21=42>>42 red and green marbles.
How many red marbles does Fred have? ** Fred has 42-4 = <<42-4=38>>38 red marbles.
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